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If you invest $17.500 today, how much will you have in each of the following instances? Use Appendix A as an approximate answer, but calculate your final answer using the formula and financial calculator methods, a. In 7 years at 8 percent? (Do not round intermediate calculations. Round your final answer to 2 decimal places.) b. In 13 years at 7 percent? (Do not round intermediate calculations. Round your final answer to 2 decimal places.) c. In 25 years at 8 percent? (Do not round intermediate calculations. Round your final answer to 2 decimal places.) d. In 20 years at 6 percent (compounded semiannually)? (Do not round intermediate calculations Round your final answer to 2 decimal places.)