Ying Import has several bond issues outstanding, each making semiannual interest payments. The bonds are listed in the table below. Maturity 7 years Bond Coupon Rate 1 8.70% 2 6.70 3 8.40 4 8.90 Price Quote 106.2 94.2 105.0 94.8 10 years 17.5 years 27 years Face Value $21,000,000 37,000,000 42,000,000 57,000,000 If the corporate tax rate is 22 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.) Aftertax cost of debt %