(E6.4/LO 3,4) (Computation of Future Values and Present Values) Using the appropriate inter- est table, answer the following questions. (Each case is independent of the others.) a. What is the future value of 20 periodic payments of $4,000 each made at the beginning of each pe- riod and compounded at 8%? b. What is the present value of $2,500 to be received at the beginning of each of 30 periods, discounted at 5% compound interest? c. What is the future value of 15 deposits of $2,000 each made at the beginning of each period and compounded at 10%? (Future value as of the end of the fifteenth period.) d. What is the present value of six receipts of $1,000 each received at the beginning of each period, discounted at 9% compounded interest