What is the present value of the following? Use Appendix B as an approximate answer, but calculate your final answer using the formula and financial calculator methods. a. $8,600 in 12 years at 8 percent? (Do not round intermediate calculations. Round your final answer to 2 decimal places.) Present value b. $20,700 in 7 years at 10 percent? (Do not round intermediate calculations. Round your final answer to 2 decimal places.) Present value c. $28,400 in 18 years at 6 percent? (Do not round intermediate calculations. Round your final answer to 2 decimal places.) Present value