Use the present value tables in Appendix A and Appendix B to compute the NPV of each of the following cash inflows: a. $19,650 received at the end of 15 years. The discount rate is 4 percent. b. $5,640 received at the end of four years and $12,200 received at the end of eight years. The discount rate is 6 percent. c. $2,140 received annually at the end of each of the next seven years. The discount rate is 4 percent. d. $52,000 received annually at the end of each of the next three years and $81,250 received at the end of the fourth year. The discount rate is 5 percent (For all requirements, round discount factor(s) to 3 decimal places, intermediate calculations and final answers to the nearest whole dollar amount.) a. Net present value b. Net present value c. Net present value d. Net present value