How much would you have to invest today to receive the following? Use Appendix B and Appendix D for an approximate answer, but calculate your final answer using the formula and financial calculator methods. a. $15,000 in 10 years at 14 percent (Do not round intermediate calculations. Round your final answer to 2 decimal places.) Present value b. $19,500 in 20 years at 15 percent. (Do not round intermediate calculations. Round your final answer to 2 decimal places.) Present value c. $7,900 each year for 19 years at 12 percent. (Do not round intermediate calculations. Round your final answer to 2 decimal pleces.) c. $7,900 each year for 19 years at 12 percent (Do not round intermediate calculations. Round your final answer to 2 decimal places.) Present value d. $54,000 each year for 50 years at 10 percent. (Do not round intermediate calculations. Round your final answer to 2 decimal places.) Present value