Please work without Excel. just formulas

Jiminy's Cricket Farm issued a bond with 15 years to maturity and a semiannual coupon rate of 6 percent 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 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 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.) c. Which is more relevant, the pretax or the aftertax cost of debt? Aftertax cost of debt Pretax cost of debt