please answer all parts of the question! (A, B, and C) thank you !

Jiminy's Cricket Farm issued a 30-year, 10.8 percent semiannual bond 5 years ago. The bond currently sells for 84.5 percent of its face value. The company's tax rate is 40 percent. Required: (a)What is the pretax cost of debt? (Do not round intermediate calculations. Enter your answer as a percentage rounded to 2 decimal places (e.g., 32.16).) (b)What is the aftertax cost of debt? (Do not round intermediate calculations. Enter your answer as a percentage rounded to 2 decimal places (e.9., 32.16).) (c) Which is more relevant, the pretax or the aftertax cost of debt