I got bills Quiz (6-9) of Udacity FEWD

quizGotBills.js

/*
 * Programming Quiz: I Got Bills (6-9)
 *
 * Use the .map() method to take the bills array below and create a second array
 * of numbers called totals. The totals array should contains each amount from the
 * bills array but with a 15% tip added. Log the totals array to the console.
 *
 * For example, the first two entries in the totals array would be:
 *
 * [57.76, 21.99, ... ]
 *
 * Things to note:
 *  - each entry in the totals array must be a number
 *  - each number must have an accuracy of two decimal points
 */

var bills = [50.23, 19.12, 34.01,
    100.11, 12.15, 9.90, 29.11, 12.99,
    10.00, 99.22, 102.20, 100.10, 6.77, 2.22
];

var totals = bills.map(function(bill) {
    bill = bill + (bill * 0.15);
    bill = bill.toFixed( 2 );
    return Number(bill);
});

console.log(totals);

var bills = [50.23, 19.12, 34.01, 100.11, 12.15, 9.90, 29.11, 12.99, 10.00, 99.22, 102.20, 100.10, 6.77, 2.22];

var totals = bills.map(bill => Number((bill += 0.15*bill).toFixed(2)));
console.log(totals);