Find the following values assuming a regular, or ordinary, annuity:
a. The present value of $5,500 per year for seen years at 8 percent
b. The future value of $5,500 per year for seven years at 8 percent
c. The present value of $11,000 per year for six years at 9 percent
d. The future value of $11,000 per year for six years at 9 percent