How much would you have lo invest today to receive Use Appendix D and AppendiXJ3 for an approximate answer, but calculate your final answer using the formula and financial calculator methods. a. $15, 000 in 8 years at 10 percent? (Do not round intermediate calculations. Round y if fin all answer to 2 decimal places.) b. $20, 000 in 12 years at 13 percent? (Do not round intermediate calculation Round your final answer to 2 decimal places.) c. $6, 000 each year for 10 years at 9 percent? (Do not round intermediate calculation Round your final answer to 2 decimal places) d. $50, 000 each year for 50 years at 7 percent? (Do not round intermediate calculations. Round your final answer to 2 decimal places.)