Question 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.
Question 2. Future Values. Compute the future value of a $100 cash flow for the same combinations of rates and times as in problem 1.