You wished to start a new business and attended the Small Business Bank. You borrowed $10,000 for 4 years. For the first 1.5 years, the interest rate on the loan was 4.8% compounded monthly. Then the rate became 3.5% compounded semiannually.

a. What total amount was required to pay off the loan if no payments were made?

b. What total amount of interest was accrued in the last 2.5 years?