CU Window, Inc., is trying to determine its cost of debt. The firm has a debt issue outstanding with 8 years to maturity that is quoted at 106.5 percent of face value. The issue makes semiannual payments and has an embedded cost of 6.4 percent annually.

a. What is the companys 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. If the tax rate is 23 percent, what is the aftertax cost of debt?