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