1. Present Values. Compute the present value of a $100 cash flow for the following combinations of discount rates and times.
a. r = 8 percent. t = 10 years
b. r = 8 percent. t = 20 years
c. r = 4 percent. t = 10 years
d. r = 4 percent. t = 20 years
2. Future Values: Compute the future value of a $100 cash flow for the same combinations of rates and times as in problem 1.