need help on problem

Jiminy's Cricket Farm issued a 15-year, 6 percent semiannual coupon bond 4 years ago. The bond currently sells for 93 percent of its face value. The company's tax rate is 23 percent a. What is the company's pretax cost of debt? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) b. What is the company's aftertax cost of debt? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g.. 32.16.) % a Pretax cost of debt b. Aftertax cost of debt %