ICU Window, Inc., is trying to determine its cost of debt. The firm has a debt issue outstanding with seven years to maturity that is quoted at 103 percent of face value. The issue makes semiannual payments and has an embedded cost of 5.1 percent annually. a. What is ICU's pretax cost of debt? a (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16; exclude the percentage sign, %.) b. If the tax rate is 21 percent, 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; exclude the percentage sign, %.)