(Present value of an annuity) What is the present value of the following annuities? a. $2,000 a year for 8 years discounted back to the present at 10 percent. b. $70 a year for 3 years discounted back to the present at 8 percent. c. $280 a year for 12 years discounted back to the present at 12 percent. d. $430 a year for 5 years discounted back to the present at 5 percent. ... a. What is the present value of $2,000 a year for 8 years discounted back to the present at 10 percent? (Round to the nearest cent.)