A recent college graduate buys a new car by borrowing $16,00

A recent college graduate buys a new car by borrowing $16,000 at 6%,compounded monthly,for 3 years.She decides to pay an extra $15 per payment.
(a) What is the monthly payment required by the loan?(Round your answer to the nearest cent.)
How much does she decide to pay each month?(Round your answer to the nearest cent.)
(b) How many payments (that include the extra $15) will she make?(Round UP to the nearest integer.)
(c) How much will she save by paying the extra $15?(Round your answer to the nearest cent.)