Ying Import has several bond issues outstanding, each making semiannual interest payments. The bonds are listed in the table below.

Bond Coupon Rate Price Quote Maturity Face Value

1 8.70% 106.7 7 years $ 26,000,000

2 6.90 93.7 10 years 32,000,000

3 8.40 105.5 17.5 years 37,000,000

4 8.90 95.3 27 years 52,000,000

If the corporate tax rate is 22 percent, what is the aftertax cost of the companys debt?

Note: Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal plac