If you invest $9,700 per period for the following number of periods, how much would you have in each of the following instances? Use Appendix C for an approximate answer, but calculate your final answer using the formula and financial calculator methods. a. In 15 years at 7 percent? (Do not round intermediate calculations. Round your final answer to 2 decimal places.) Future value b. In 25 years at 11 percent? (Do not round Intermediate calculations. Round your final answer to 2 decimal places.) Future value