Ying Import has several bond issues outstanding, each making semiannual interest payments. The bonds are listed in the following table. Bond Price Quote 2 3 4 Coupon Rate 6.1% 7.6 7.3 6.9 106.06 114.62 113.17 102.41 Maturity 5 years 8 years 15.5 years 25 years Face Value $ 41,000,000 36,000,000 56,000,000 63,000,000 If the corporate tax rate is 21 percent, what is the aftertax cost of the company's debt? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) Cost of debt %