Assume that you make the following investments:
a. You invest a lump sum of $7,550 for three years at 12% interest. What is the investment's value at the end of three years?
b. In a different account earning 12% interest, you invest $2,517 at the end of each year for three years. What is the investment's value at the end of three years?
c. What general rule of thumb explains the difference in the investments' future values?