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 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));
}
}
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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