Problem 5-22 (similar to) (Present value of an annuity) What is the present value of the following annuities? a. $2,800 a year for 9 years discounted back to the present at 10 percent. b. $90 a year for 3 years discounted back to the present at 8 percent. c. $270 a year for 13 years discounted back to the present at 11 percent. d. $510 a year for 5 years discounted back to the present at 4 percent. a. What is the present value of $2,800 a year for 9 years discounted back to the present at 10 percent? (Round to the nearest cent.)