Suppose you borrow $ 15000 to buy a car. You will make monthly payments for 5 years with an interest rate of 7% per year compounded monthly? a) (7 pts.) What is the monthly payment? Round your answer to the nearest cent. b) (5 pts.) If you could pay an extra $50 per month, how many years will it take to pay off the loan? Round your answer to the nearest hundredth