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. $15,250 in 11 years at 7 percent. (Do not round intermediate calculations. Round your final answer to 2 decimal places.) Present value b. $19,600 in 18 years at 11 percent. (Do not round intermediate calculations, Round your final answer to 2 decimal places.) Present value c. $8,000 each year for 14 years at 8 percent. (Do not round intermediate calculations, Round your final answer to 2 decimal places.) Present value d. $55,000 each year for 20 years at 14 percent. (Do not round intermediate calculations. Round your final answer to 2 decimal places.) Present value