Use the present value tables in Appendix A and Appendix B to compute the NPV of each of the following cash inflows: Required: a. $20,500 received at the end of 15 years. The discount rate is 3 percent. b. $7,620 received at the end of four years and $16,000 received at the end of eight years. The discount rate is 5 percent. c. $1,920 received annually at the end of each of the next seven years. The discount rate is 8 percent. d. $59,000 received annually at the end of each of the next three years and $67,250 received at the end of the fourth year. The discount rate is 4 percent. Note: For all requirements, round discount factor(s) to 3 decimal places, all other intermediate calculations and final answers to the nearest whole dollar amount. Amount a. Net present value b. Net present value c. Net present value d. Net present value