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The toFixed() method formats a number using fixed-point notation.

function financial(x) {
  return Number.parseFloat(x).toFixed(2);
}

console.log(financial(123.456));
// expected output: "123.46"

console.log(financial(0.004));
// expected output: "0.00"

console.log(financial('1.23e+5'));
// expected output: "123000.00"

OUTPUT:
> "123.46"
> "0.00"
> "123000.00"