Chapter 6, Problem 1E

Question

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Answer 1

Question

Chapter 6, Problem 1E

Expert Solution & Answer

Program Plan Intro

Tax computation

Program plan:

• Define the class “TaxComputer”.
- ○ Declare the necessary constant variables.
- ○ Define the method “changeBasicRateTo()”.
  - ■ Assign “newRate” into the variable “basicRate”.
- ○ Define the method “changeLuxuryRateTo()”.
  - ■ Assign “newRate” into the variable “luxuryRate”.
- ○ Define the method “computeCostBasic()”.
  - ■ Calculate “tax”, and “price”.
  - ■ Return the value.
- ○ Define the method “computeCostLuxury()”.
  - ■ Calculate “tax”, and “price”.
  - ■ Return the value.
- ○ Define the method “roundToNearestPenny()”.
  - ■ Calculate the price.
  - ■ Return the value.
- ○ Define the “main()” function.
  - ■ Print the result by calling the appropriate methods.

Program Description Answer

Program to display the tax computation of the computer.

Explanation of Solution

Program:

//Define the class

public class TaxComputer

{

//Declare the necessary constant variables

private static double basicRate = 4.0;

private static double luxuryRate = 10.0;

//Define the function changeBasicRateTo()

public static void changeBasicRateTo(double newRate)

{

/*Assign "newRate" into the variable “basicRate”*/

basicRate = newRate;

}

//Define the function changeLuxuryRateTo()

public static void changeLuxuryRateTo(double newRate)

{

/*Assign "newRate" into the variable “luxuryRate”*/

luxuryRate = newRate;

}

//Define the function computeCostBasic()

public static double computeCostBasic(double price)

{

//Calculate the “tax”

double tax = price * basicRate / 100;

//Calculate the “price”

price = price + tax;

//Return the value

return roundToNearestPenny(price);

}

//Define the function computeCostLuxury()

public static double computeCostLuxury(double price)

{

//Calculate the "tax"

double tax = price * luxuryRate / 100;

//Calculate the "price"

price = price + tax;

//Return the value

return roundToNearestPenny(price);

}

//Define the function roundToNearestPenny()

private static double roundToNearestPenny(double price)

{

//Calculate the "price"

price = price * 100;

price = java.lang.Math.round(price);

//Return the value

return price/100;

}

//Define the main() function

public static void main(String[] args)

{

//Print the statement

System.out.println("Testing the basic rate computation.");

//Print the statement

System.out.println(" Item price no tax:10.00");

//Print the statement

System.out.println("cost with 4% tax: "+ TaxComputer.computeCostBasic(10.00));

//Print the statement

System.out.println("Testing the basic rate computation.");

//Call the function changeBasicRateTo()

TaxComputer.changeBasicRateTo(7.5);

//Print the statement

System.out.println(" Item price no tax: 10.00");

//Print the statement

System.out.println("cost with 7.5% tax: "+ TaxComputer.computeCostBasic(10.00));

//Print the statement

System.out.println("Testing the luxury rate computation.");

//Print the statement

System.out.println(" Item price no tax: 2019.25");

//Print the statement

System.out.println("cost with 10% tax: "+ TaxComputer.computeCostLuxury(2019.25));

//Print the statement

System.out.println("Testing the luxury rate computation.");

//Call the function changeLuxuryRateTo()

TaxComputer.changeLuxuryRateTo(20.0);

//Print the statement

System.out.println(" Item price no tax: 2019.25");

//Print the statement

System.out.println("cost with 20% tax: "+ TaxComputer.computeCostLuxury(2019.25));

//Print the statement

System.out.println("Testing the basic rate again, should still be 7.5%.");

//Print the statement

System.out.println(" Item price no tax: 210.99");

//Print the statement

System.out.println("cost with 7.5% tax: "+ TaxComputer.computeCostBasic(210.99));

}

Sample Output

Output:

Testing the basic rate computation.

Item price no tax: 10.00

cost with 4% tax: 10.4

Testing the basic rate computation.

Item price no tax: 10.00

cost with 7.5% tax: 10.75

Testing the luxury rate computation.

Item price no tax: 2019.25

cost with 10% tax: 2221.18

Testing the luxury rate computation.

Item price no tax: 2019.25

cost with 20% tax: 2423.1

Testing the basic rate again, should still be 7.5%.

Item price no tax: 210.99

cost with 7.5% tax: 226.81

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Answer 2

Question

Chapter 6, Problem 1E

Expert Solution & Answer

Program Plan Intro

Tax computation

Program plan:

• Define the class “TaxComputer”.
- ○ Declare the necessary constant variables.
- ○ Define the method “changeBasicRateTo()”.
  - ■ Assign “newRate” into the variable “basicRate”.
- ○ Define the method “changeLuxuryRateTo()”.
  - ■ Assign “newRate” into the variable “luxuryRate”.
- ○ Define the method “computeCostBasic()”.
  - ■ Calculate “tax”, and “price”.
  - ■ Return the value.
- ○ Define the method “computeCostLuxury()”.
  - ■ Calculate “tax”, and “price”.
  - ■ Return the value.
- ○ Define the method “roundToNearestPenny()”.
  - ■ Calculate the price.
  - ■ Return the value.
- ○ Define the “main()” function.
  - ■ Print the result by calling the appropriate methods.

Program Description Answer

Program to display the tax computation of the computer.

Explanation of Solution

Program:

//Define the class

public class TaxComputer

{

//Declare the necessary constant variables

private static double basicRate = 4.0;

private static double luxuryRate = 10.0;

//Define the function changeBasicRateTo()

public static void changeBasicRateTo(double newRate)

{

/*Assign "newRate" into the variable “basicRate”*/

basicRate = newRate;

}

//Define the function changeLuxuryRateTo()

public static void changeLuxuryRateTo(double newRate)

{

/*Assign "newRate" into the variable “luxuryRate”*/

luxuryRate = newRate;

}

//Define the function computeCostBasic()

public static double computeCostBasic(double price)

{

//Calculate the “tax”

double tax = price * basicRate / 100;

//Calculate the “price”

price = price + tax;

//Return the value

return roundToNearestPenny(price);

}

//Define the function computeCostLuxury()

public static double computeCostLuxury(double price)

{

//Calculate the "tax"

double tax = price * luxuryRate / 100;

//Calculate the "price"

price = price + tax;

//Return the value

return roundToNearestPenny(price);

}

//Define the function roundToNearestPenny()

private static double roundToNearestPenny(double price)

{

//Calculate the "price"

price = price * 100;

price = java.lang.Math.round(price);

//Return the value

return price/100;

}

//Define the main() function

public static void main(String[] args)

{

//Print the statement

System.out.println("Testing the basic rate computation.");

//Print the statement

System.out.println(" Item price no tax:10.00");

//Print the statement

System.out.println("cost with 4% tax: "+ TaxComputer.computeCostBasic(10.00));

//Print the statement

System.out.println("Testing the basic rate computation.");

//Call the function changeBasicRateTo()

TaxComputer.changeBasicRateTo(7.5);

//Print the statement

System.out.println(" Item price no tax: 10.00");

//Print the statement

System.out.println("cost with 7.5% tax: "+ TaxComputer.computeCostBasic(10.00));

//Print the statement

System.out.println("Testing the luxury rate computation.");

//Print the statement

System.out.println(" Item price no tax: 2019.25");

//Print the statement

System.out.println("cost with 10% tax: "+ TaxComputer.computeCostLuxury(2019.25));

//Print the statement

System.out.println("Testing the luxury rate computation.");

//Call the function changeLuxuryRateTo()

TaxComputer.changeLuxuryRateTo(20.0);

//Print the statement

System.out.println(" Item price no tax: 2019.25");

//Print the statement

System.out.println("cost with 20% tax: "+ TaxComputer.computeCostLuxury(2019.25));

//Print the statement

System.out.println("Testing the basic rate again, should still be 7.5%.");

//Print the statement

System.out.println(" Item price no tax: 210.99");

//Print the statement

System.out.println("cost with 7.5% tax: "+ TaxComputer.computeCostBasic(210.99));

}

Sample Output

Output:

Testing the basic rate computation.

Item price no tax: 10.00

cost with 4% tax: 10.4

Testing the basic rate computation.

Item price no tax: 10.00

cost with 7.5% tax: 10.75

Testing the luxury rate computation.

Item price no tax: 2019.25

cost with 10% tax: 2221.18

Testing the luxury rate computation.

Item price no tax: 2019.25

cost with 20% tax: 2423.1

Testing the basic rate again, should still be 7.5%.

Item price no tax: 210.99

cost with 7.5% tax: 226.81

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Answer 3

Question

Chapter 6, Problem 1E

Expert Solution & Answer

Program Plan Intro

Tax computation

Program plan:

• Define the class “TaxComputer”.
- ○ Declare the necessary constant variables.
- ○ Define the method “changeBasicRateTo()”.
  - ■ Assign “newRate” into the variable “basicRate”.
- ○ Define the method “changeLuxuryRateTo()”.
  - ■ Assign “newRate” into the variable “luxuryRate”.
- ○ Define the method “computeCostBasic()”.
  - ■ Calculate “tax”, and “price”.
  - ■ Return the value.
- ○ Define the method “computeCostLuxury()”.
  - ■ Calculate “tax”, and “price”.
  - ■ Return the value.
- ○ Define the method “roundToNearestPenny()”.
  - ■ Calculate the price.
  - ■ Return the value.
- ○ Define the “main()” function.
  - ■ Print the result by calling the appropriate methods.

Program Description Answer

Program to display the tax computation of the computer.

Explanation of Solution

Program:

//Define the class

public class TaxComputer

{

//Declare the necessary constant variables

private static double basicRate = 4.0;

private static double luxuryRate = 10.0;

//Define the function changeBasicRateTo()

public static void changeBasicRateTo(double newRate)

{

/*Assign "newRate" into the variable “basicRate”*/

basicRate = newRate;

}

//Define the function changeLuxuryRateTo()

public static void changeLuxuryRateTo(double newRate)

{

/*Assign "newRate" into the variable “luxuryRate”*/

luxuryRate = newRate;

}

//Define the function computeCostBasic()

public static double computeCostBasic(double price)

{

//Calculate the “tax”

double tax = price * basicRate / 100;

//Calculate the “price”

price = price + tax;

//Return the value

return roundToNearestPenny(price);

}

//Define the function computeCostLuxury()

public static double computeCostLuxury(double price)

{

//Calculate the "tax"

double tax = price * luxuryRate / 100;

//Calculate the "price"

price = price + tax;

//Return the value

return roundToNearestPenny(price);

}

//Define the function roundToNearestPenny()

private static double roundToNearestPenny(double price)

{

//Calculate the "price"

price = price * 100;

price = java.lang.Math.round(price);

//Return the value

return price/100;

}

//Define the main() function

public static void main(String[] args)

{

//Print the statement

System.out.println("Testing the basic rate computation.");

//Print the statement

System.out.println(" Item price no tax:10.00");

//Print the statement

System.out.println("cost with 4% tax: "+ TaxComputer.computeCostBasic(10.00));

//Print the statement

System.out.println("Testing the basic rate computation.");

//Call the function changeBasicRateTo()

TaxComputer.changeBasicRateTo(7.5);

//Print the statement

System.out.println(" Item price no tax: 10.00");

//Print the statement

System.out.println("cost with 7.5% tax: "+ TaxComputer.computeCostBasic(10.00));

//Print the statement

System.out.println("Testing the luxury rate computation.");

//Print the statement

System.out.println(" Item price no tax: 2019.25");

//Print the statement

System.out.println("cost with 10% tax: "+ TaxComputer.computeCostLuxury(2019.25));

//Print the statement

System.out.println("Testing the luxury rate computation.");

//Call the function changeLuxuryRateTo()

TaxComputer.changeLuxuryRateTo(20.0);

//Print the statement

System.out.println(" Item price no tax: 2019.25");

//Print the statement

System.out.println("cost with 20% tax: "+ TaxComputer.computeCostLuxury(2019.25));

//Print the statement

System.out.println("Testing the basic rate again, should still be 7.5%.");

//Print the statement

System.out.println(" Item price no tax: 210.99");

//Print the statement

System.out.println("cost with 7.5% tax: "+ TaxComputer.computeCostBasic(210.99));

}

Sample Output

Output:

Testing the basic rate computation.

Item price no tax: 10.00

cost with 4% tax: 10.4

Testing the basic rate computation.

Item price no tax: 10.00

cost with 7.5% tax: 10.75

Testing the luxury rate computation.

Item price no tax: 2019.25

cost with 10% tax: 2221.18

Testing the luxury rate computation.

Item price no tax: 2019.25

cost with 20% tax: 2423.1

Testing the basic rate again, should still be 7.5%.

Item price no tax: 210.99

cost with 7.5% tax: 226.81

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Answer 4

Question

Chapter 6, Problem 1E

Expert Solution & Answer

Program Plan Intro

Tax computation

Program plan:

• Define the class “TaxComputer”.
- ○ Declare the necessary constant variables.
- ○ Define the method “changeBasicRateTo()”.
  - ■ Assign “newRate” into the variable “basicRate”.
- ○ Define the method “changeLuxuryRateTo()”.
  - ■ Assign “newRate” into the variable “luxuryRate”.
- ○ Define the method “computeCostBasic()”.
  - ■ Calculate “tax”, and “price”.
  - ■ Return the value.
- ○ Define the method “computeCostLuxury()”.
  - ■ Calculate “tax”, and “price”.
  - ■ Return the value.
- ○ Define the method “roundToNearestPenny()”.
  - ■ Calculate the price.
  - ■ Return the value.
- ○ Define the “main()” function.
  - ■ Print the result by calling the appropriate methods.

Program Description Answer

Program to display the tax computation of the computer.

Explanation of Solution

Program:

//Define the class

public class TaxComputer

{

//Declare the necessary constant variables

private static double basicRate = 4.0;

private static double luxuryRate = 10.0;

//Define the function changeBasicRateTo()

public static void changeBasicRateTo(double newRate)

{

/*Assign "newRate" into the variable “basicRate”*/

basicRate = newRate;

}

//Define the function changeLuxuryRateTo()

public static void changeLuxuryRateTo(double newRate)

{

/*Assign "newRate" into the variable “luxuryRate”*/

luxuryRate = newRate;

}

//Define the function computeCostBasic()

public static double computeCostBasic(double price)

{

//Calculate the “tax”

double tax = price * basicRate / 100;

//Calculate the “price”

price = price + tax;

//Return the value

return roundToNearestPenny(price);

}

//Define the function computeCostLuxury()

public static double computeCostLuxury(double price)

{

//Calculate the "tax"

double tax = price * luxuryRate / 100;

//Calculate the "price"

price = price + tax;

//Return the value

return roundToNearestPenny(price);

}

//Define the function roundToNearestPenny()

private static double roundToNearestPenny(double price)

{

//Calculate the "price"

price = price * 100;

price = java.lang.Math.round(price);

//Return the value

return price/100;

}

//Define the main() function

public static void main(String[] args)

{

//Print the statement

System.out.println("Testing the basic rate computation.");

//Print the statement

System.out.println(" Item price no tax:10.00");

//Print the statement

System.out.println("cost with 4% tax: "+ TaxComputer.computeCostBasic(10.00));

//Print the statement

System.out.println("Testing the basic rate computation.");

//Call the function changeBasicRateTo()

TaxComputer.changeBasicRateTo(7.5);

//Print the statement

System.out.println(" Item price no tax: 10.00");

//Print the statement

System.out.println("cost with 7.5% tax: "+ TaxComputer.computeCostBasic(10.00));

//Print the statement

System.out.println("Testing the luxury rate computation.");

//Print the statement

System.out.println(" Item price no tax: 2019.25");

//Print the statement

System.out.println("cost with 10% tax: "+ TaxComputer.computeCostLuxury(2019.25));

//Print the statement

System.out.println("Testing the luxury rate computation.");

//Call the function changeLuxuryRateTo()

TaxComputer.changeLuxuryRateTo(20.0);

//Print the statement

System.out.println(" Item price no tax: 2019.25");

//Print the statement

System.out.println("cost with 20% tax: "+ TaxComputer.computeCostLuxury(2019.25));

//Print the statement

System.out.println("Testing the basic rate again, should still be 7.5%.");

//Print the statement

System.out.println(" Item price no tax: 210.99");

//Print the statement

System.out.println("cost with 7.5% tax: "+ TaxComputer.computeCostBasic(210.99));

}

Sample Output

Output:

Testing the basic rate computation.

Item price no tax: 10.00

cost with 4% tax: 10.4

Testing the basic rate computation.

Item price no tax: 10.00

cost with 7.5% tax: 10.75

Testing the luxury rate computation.

Item price no tax: 2019.25

cost with 10% tax: 2221.18

Testing the luxury rate computation.

Item price no tax: 2019.25

cost with 20% tax: 2423.1

Testing the basic rate again, should still be 7.5%.

Item price no tax: 210.99

cost with 7.5% tax: 226.81

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Answer 5

Expert Solution & Answer

Program Plan Intro

Tax computation

Program plan:

• Define the class “TaxComputer”.
- ○ Declare the necessary constant variables.
- ○ Define the method “changeBasicRateTo()”.
  - ■ Assign “newRate” into the variable “basicRate”.
- ○ Define the method “changeLuxuryRateTo()”.
  - ■ Assign “newRate” into the variable “luxuryRate”.
- ○ Define the method “computeCostBasic()”.
  - ■ Calculate “tax”, and “price”.
  - ■ Return the value.
- ○ Define the method “computeCostLuxury()”.
  - ■ Calculate “tax”, and “price”.
  - ■ Return the value.
- ○ Define the method “roundToNearestPenny()”.
  - ■ Calculate the price.
  - ■ Return the value.
- ○ Define the “main()” function.
  - ■ Print the result by calling the appropriate methods.

Program Description Answer

Program to display the tax computation of the computer.

Explanation of Solution

Program:

//Define the class

public class TaxComputer

{

//Declare the necessary constant variables

private static double basicRate = 4.0;

private static double luxuryRate = 10.0;

//Define the function changeBasicRateTo()

public static void changeBasicRateTo(double newRate)

{

/*Assign "newRate" into the variable “basicRate”*/

basicRate = newRate;

}

//Define the function changeLuxuryRateTo()

public static void changeLuxuryRateTo(double newRate)

{

/*Assign "newRate" into the variable “luxuryRate”*/

luxuryRate = newRate;

}

//Define the function computeCostBasic()

public static double computeCostBasic(double price)

{

//Calculate the “tax”

double tax = price * basicRate / 100;

//Calculate the “price”

price = price + tax;

//Return the value

return roundToNearestPenny(price);

}

//Define the function computeCostLuxury()

public static double computeCostLuxury(double price)

{

//Calculate the "tax"

double tax = price * luxuryRate / 100;

//Calculate the "price"

price = price + tax;

//Return the value

return roundToNearestPenny(price);

}

//Define the function roundToNearestPenny()

private static double roundToNearestPenny(double price)

{

//Calculate the "price"

price = price * 100;

price = java.lang.Math.round(price);

//Return the value

return price/100;

}

//Define the main() function

public static void main(String[] args)

{

//Print the statement

System.out.println("Testing the basic rate computation.");

//Print the statement

System.out.println(" Item price no tax:10.00");

//Print the statement

System.out.println("cost with 4% tax: "+ TaxComputer.computeCostBasic(10.00));

//Print the statement

System.out.println("Testing the basic rate computation.");

//Call the function changeBasicRateTo()

TaxComputer.changeBasicRateTo(7.5);

//Print the statement

System.out.println(" Item price no tax: 10.00");

//Print the statement

System.out.println("cost with 7.5% tax: "+ TaxComputer.computeCostBasic(10.00));

//Print the statement

System.out.println("Testing the luxury rate computation.");

//Print the statement

System.out.println(" Item price no tax: 2019.25");

//Print the statement

System.out.println("cost with 10% tax: "+ TaxComputer.computeCostLuxury(2019.25));

//Print the statement

System.out.println("Testing the luxury rate computation.");

//Call the function changeLuxuryRateTo()

TaxComputer.changeLuxuryRateTo(20.0);

//Print the statement

System.out.println(" Item price no tax: 2019.25");

//Print the statement

System.out.println("cost with 20% tax: "+ TaxComputer.computeCostLuxury(2019.25));

//Print the statement

System.out.println("Testing the basic rate again, should still be 7.5%.");

//Print the statement

System.out.println(" Item price no tax: 210.99");

//Print the statement

System.out.println("cost with 7.5% tax: "+ TaxComputer.computeCostBasic(210.99));

}

Sample Output

Output:

Testing the basic rate computation.

Item price no tax: 10.00

cost with 4% tax: 10.4

Testing the basic rate computation.

Item price no tax: 10.00

cost with 7.5% tax: 10.75

Testing the luxury rate computation.

Item price no tax: 2019.25

cost with 10% tax: 2221.18

Testing the luxury rate computation.

Item price no tax: 2019.25

cost with 20% tax: 2423.1

Testing the basic rate again, should still be 7.5%.

Item price no tax: 210.99

cost with 7.5% tax: 226.81

Answer 6

Expert Solution & Answer

Program Plan Intro

Tax computation

Program plan:

• Define the class “TaxComputer”.
- ○ Declare the necessary constant variables.
- ○ Define the method “changeBasicRateTo()”.
  - ■ Assign “newRate” into the variable “basicRate”.
- ○ Define the method “changeLuxuryRateTo()”.
  - ■ Assign “newRate” into the variable “luxuryRate”.
- ○ Define the method “computeCostBasic()”.
  - ■ Calculate “tax”, and “price”.
  - ■ Return the value.
- ○ Define the method “computeCostLuxury()”.
  - ■ Calculate “tax”, and “price”.
  - ■ Return the value.
- ○ Define the method “roundToNearestPenny()”.
  - ■ Calculate the price.
  - ■ Return the value.
- ○ Define the “main()” function.
  - ■ Print the result by calling the appropriate methods.

Program Description Answer

Program to display the tax computation of the computer.

Explanation of Solution

Program:

//Define the class

public class TaxComputer

{

//Declare the necessary constant variables

private static double basicRate = 4.0;

private static double luxuryRate = 10.0;

//Define the function changeBasicRateTo()

public static void changeBasicRateTo(double newRate)

{

/*Assign "newRate" into the variable “basicRate”*/

basicRate = newRate;

}

//Define the function changeLuxuryRateTo()

public static void changeLuxuryRateTo(double newRate)

{

/*Assign "newRate" into the variable “luxuryRate”*/

luxuryRate = newRate;

}

//Define the function computeCostBasic()

public static double computeCostBasic(double price)

{

//Calculate the “tax”

double tax = price * basicRate / 100;

//Calculate the “price”

price = price + tax;

//Return the value

return roundToNearestPenny(price);

}

//Define the function computeCostLuxury()

public static double computeCostLuxury(double price)

{

//Calculate the "tax"

double tax = price * luxuryRate / 100;

//Calculate the "price"

price = price + tax;

//Return the value

return roundToNearestPenny(price);

}

//Define the function roundToNearestPenny()

private static double roundToNearestPenny(double price)

{

//Calculate the "price"

price = price * 100;

price = java.lang.Math.round(price);

//Return the value

return price/100;

}

//Define the main() function

public static void main(String[] args)

{

//Print the statement

System.out.println("Testing the basic rate computation.");

//Print the statement

System.out.println(" Item price no tax:10.00");

//Print the statement

System.out.println("cost with 4% tax: "+ TaxComputer.computeCostBasic(10.00));

//Print the statement

System.out.println("Testing the basic rate computation.");

//Call the function changeBasicRateTo()

TaxComputer.changeBasicRateTo(7.5);

//Print the statement

System.out.println(" Item price no tax: 10.00");

//Print the statement

System.out.println("cost with 7.5% tax: "+ TaxComputer.computeCostBasic(10.00));

//Print the statement

System.out.println("Testing the luxury rate computation.");

//Print the statement

System.out.println(" Item price no tax: 2019.25");

//Print the statement

System.out.println("cost with 10% tax: "+ TaxComputer.computeCostLuxury(2019.25));

//Print the statement

System.out.println("Testing the luxury rate computation.");

//Call the function changeLuxuryRateTo()

TaxComputer.changeLuxuryRateTo(20.0);

//Print the statement

System.out.println(" Item price no tax: 2019.25");

//Print the statement

System.out.println("cost with 20% tax: "+ TaxComputer.computeCostLuxury(2019.25));

//Print the statement

System.out.println("Testing the basic rate again, should still be 7.5%.");

//Print the statement

System.out.println(" Item price no tax: 210.99");

//Print the statement

System.out.println("cost with 7.5% tax: "+ TaxComputer.computeCostBasic(210.99));

}

Sample Output

Output:

Testing the basic rate computation.

Item price no tax: 10.00

cost with 4% tax: 10.4

Testing the basic rate computation.

Item price no tax: 10.00

cost with 7.5% tax: 10.75

Testing the luxury rate computation.

Item price no tax: 2019.25

cost with 10% tax: 2221.18

Testing the luxury rate computation.

Item price no tax: 2019.25

cost with 20% tax: 2423.1

Testing the basic rate again, should still be 7.5%.

Item price no tax: 210.99

cost with 7.5% tax: 226.81

Answer 7

Expert Solution & Answer

Answer 8

Expert Solution & Answer

Answer 9

Program Plan Intro

Tax computation

Program plan:

• Define the class “TaxComputer”.
- ○ Declare the necessary constant variables.
- ○ Define the method “changeBasicRateTo()”.
  - ■ Assign “newRate” into the variable “basicRate”.
- ○ Define the method “changeLuxuryRateTo()”.
  - ■ Assign “newRate” into the variable “luxuryRate”.
- ○ Define the method “computeCostBasic()”.
  - ■ Calculate “tax”, and “price”.
  - ■ Return the value.
- ○ Define the method “computeCostLuxury()”.
  - ■ Calculate “tax”, and “price”.
  - ■ Return the value.
- ○ Define the method “roundToNearestPenny()”.
  - ■ Calculate the price.
  - ■ Return the value.
- ○ Define the “main()” function.
  - ■ Print the result by calling the appropriate methods.

Answer 10

Program Description Answer

Program to display the tax computation of the computer.

Answer 11

Explanation of Solution

Program:

//Define the class

public class TaxComputer

{

//Declare the necessary constant variables

private static double basicRate = 4.0;

private static double luxuryRate = 10.0;

//Define the function changeBasicRateTo()

public static void changeBasicRateTo(double newRate)

{

/*Assign "newRate" into the variable “basicRate”*/

basicRate = newRate;

}

//Define the function changeLuxuryRateTo()

public static void changeLuxuryRateTo(double newRate)

{

/*Assign "newRate" into the variable “luxuryRate”*/

luxuryRate = newRate;

}

//Define the function computeCostBasic()

public static double computeCostBasic(double price)

{

//Calculate the “tax”

double tax = price * basicRate / 100;

//Calculate the “price”

price = price + tax;

//Return the value

return roundToNearestPenny(price);

}

//Define the function computeCostLuxury()

public static double computeCostLuxury(double price)

{

//Calculate the "tax"

double tax = price * luxuryRate / 100;

//Calculate the "price"

price = price + tax;

//Return the value

return roundToNearestPenny(price);

}

//Define the function roundToNearestPenny()

private static double roundToNearestPenny(double price)

{

//Calculate the "price"

price = price * 100;

price = java.lang.Math.round(price);

//Return the value

return price/100;

}

//Define the main() function

public static void main(String[] args)

{

//Print the statement

System.out.println("Testing the basic rate computation.");

//Print the statement

System.out.println(" Item price no tax:10.00");

//Print the statement

System.out.println("cost with 4% tax: "+ TaxComputer.computeCostBasic(10.00));

//Print the statement

System.out.println("Testing the basic rate computation.");

//Call the function changeBasicRateTo()

TaxComputer.changeBasicRateTo(7.5);

//Print the statement

System.out.println(" Item price no tax: 10.00");

//Print the statement

System.out.println("cost with 7.5% tax: "+ TaxComputer.computeCostBasic(10.00));

//Print the statement

System.out.println("Testing the luxury rate computation.");

//Print the statement

System.out.println(" Item price no tax: 2019.25");

//Print the statement

System.out.println("cost with 10% tax: "+ TaxComputer.computeCostLuxury(2019.25));

//Print the statement

System.out.println("Testing the luxury rate computation.");

//Call the function changeLuxuryRateTo()

TaxComputer.changeLuxuryRateTo(20.0);

//Print the statement

System.out.println(" Item price no tax: 2019.25");

//Print the statement

System.out.println("cost with 20% tax: "+ TaxComputer.computeCostLuxury(2019.25));

//Print the statement

System.out.println("Testing the basic rate again, should still be 7.5%.");

//Print the statement

System.out.println(" Item price no tax: 210.99");

//Print the statement

System.out.println("cost with 7.5% tax: "+ TaxComputer.computeCostBasic(210.99));

}

Answer 12

Sample Output

Output:

Testing the basic rate computation.

Item price no tax: 10.00

cost with 4% tax: 10.4

Testing the basic rate computation.

Item price no tax: 10.00

cost with 7.5% tax: 10.75

Testing the luxury rate computation.

Item price no tax: 2019.25

cost with 10% tax: 2221.18

Testing the luxury rate computation.

Item price no tax: 2019.25

cost with 20% tax: 2423.1

Testing the basic rate again, should still be 7.5%.

Item price no tax: 210.99

cost with 7.5% tax: 226.81

Answer 13

Chapter 6.1, Problem 1STQ Chapter 6.1, Problem 2STQ Chapter 6.1, Problem 3STQ Chapter 6.1, Problem 4STQ Chapter 6.1, Problem 5STQ Chapter 6.2, Problem 6STQ Chapter 6.2, Problem 7STQ Chapter 6.2, Problem 8STQ Chapter 6.2, Problem 9STQ Chapter 6.2, Problem 10STQ

Chapter 6, Problem 1E

Explanation of Solution

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