(Present value of an annuity due) Determine the present value of an annuity due of $7,000 per year for 8 years discounted back to the present at an annual rate of 13 percent. What would be the present value of this annuity due if it were discounted at an annual rate of 18 percent? a. If the annual discount rate is 13 percent, the present value of the annuity due is $ (Round to the nearest cent.) b. If the annual discount rate is 18 percent, the present value of the annuity due is $. (Round to the nearest cent.)