Jiminy's Cricket Farm issued a 30-year, 8.4 percent semiannual bond 9 years ago. The bond currently sells for 90.5 percent of its face value. The companys tax rate is 30 percent. a. What is the 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.) Pretax cost of debt % b. What is the 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.) Aftertax cost of debt % c. Which is more relevant, the pretax or the aftertax cost of debt?