Which is more relevant, pretax or the aftertax cost of debt?

Jiminy's Cricket Farm issued a bond with 25 years to maturity and a semiannual coupon rate of 5 percent 6 years ago. The bond currently sells for 106 percent of its face value. The company's tax rate is 25 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.) 4.53 Pretax cost of debt Aftertax cost of debt 3.40 %