The Lone Star Company has $1,000 par value bonds outstanding at 10 percent interest. The bonds will mature in 20 years. Use Appendix B and Appendix D for an approximate answer but calculate your final answer using the formula and financial calculator methods. Compute the current price of the bonds if the present yield to maturity is: (Do not round intermediate calculations. Round your final answers to 2 decimal places. Assume interest payments are annual.) a. 6% b. 9% c. 13%