This problem demonstrates the dependence of an annuity's present value on the size of the periodic payment. Calculate the present value of 20 end-of-year payments of: (Do not round intermediate calculations and round your final answers to 2 decimal places.) a. $2,500 b. $3,500 c. $4,500 Use a discount rate of 6.5% compounded annually. After completing the calculations, note that the present value is proportional to the size of the periodic payment