If you invest $15,500 today, how much will you have in each of the following instances? Use AppendixA as an approximate answer, but calculate your final answer using the formula and financial calculator methods. a. In 8 years at 7 percent? (Do not round intermediate calculations. Round your final answer to 2 decimal places.) b. In 19 years at 10 percent? (Do not round intermediate calculations. Round your final answer to 2 decimal places.) c. In 20 years at 12 percent? (Do not round intermediate calculations. Round your final answer to 2 decimal places.) d. In 25 years at 12 percent (compounded semiannually)? (Do not round intermediate calculations. Round your final answer to 2 decimal places.)