Waller, Inc., is trying to determine its cost of debt. The firm has a debt issue outstanding with 11 years to maturity that is quoted at 100 percent of face value. The issue makes semiannual payments and has an embedded cost of 9 percent annually. The tax rate is 36 percent.

Required:
a. The company's pretax cost of debt is:_______
b. The aftertax cost of debt is:________