What is the present value of Use Appendix B as an approximate answer, but calculate your final answer using the formula and financial calculator metheds $8,400 in 12 years at 11 percent? (Do not round intermediate calculations. Round your final answer to 2 decimal places.) $17,200 in 6 years at 9 percent'? (Do not round intermediate calculations. Round your final answer to ? decimal places.) $26,800 in 18 years at 10 percent? (Do not round intermediate calculations. Round your final answer to 2 decimal places.)