Shanken Corp. issued a 18-year, 8 percent semiannual bond 3 years ago. The bond currently sells for 92 percent of its face value. The book value of the debt issue is $45 million. In addition, the company has a second debt issue on the market, a zero coupon bond with 12 years left to maturity; the book value of this issue is $35 million and the bonds sell for 51 percent of par. The company’s tax rate is 40 percent. What is your best estimate of 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.)