Use the present value tables in Appendix A and Appendix B to compute the NPV of each of the following cash inflows: a. $18,550 received at the end of 15 years. The discount rate is 5 percent b. $6,680 received at the end of four years and $13,900 received at the end of eight years. The discount rate is 7 percent. c. $1,530 received annually at the end of each of the next seven years. The discount rate is 4 percent. d. $63,250 received annually at the end of each of the next three years and $82,500 received at the end of the fourth year. The discount rate is 6 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