The trustees of a college have accepted a gift of $150000, but are required to deposit it in an account paying 10% per year, compounded semiannually. They may make equal withdrawals at the end of each six-month period, but the money must last 7 years. a. Find the amount of each withdrawal. b. Find the amount of each withdrawal if the money must last 9 years. a. The amount of each withdrawal is $ (Round your answer to the nearest cent.) b. If the money must last 9 years, the amount of each withdrawal is 9 (Round your answer to the nearest cent.)