Ying Import has several bond issues outstanding, each making semiannual interest payments. The bonds are listed in the table below. Bond 234 Coupon Rate 8.60% 6.90 8.30 8.80 Price Quote 105.1 95.3 103.9 105.8 Maturity 6 years Face Value $ 21,000,000 9 years 16.5 years 26 years 41,000,000 46,000,000 61,000,000 If the corporate tax rate is 21 percent, what is the aftertax cost of the company's debt? Note: 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 %