For the student loan in Problem 4.9, graph the monthly payment:
(a) As a function of the interest rate (from 4-10%).
(b) As a function of the number of payments (24-60).
Calculate and print out an amortization schedule to repay a student loan. The nominal interest rate is 6% per year, compounded monthly. Payments are made monthly for 3 years. The original loan is for $12,000.