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 8.60 % 106.1 6 years $ 20,000,000

2 6.60 94.3 9 years 38,000,000

3 8.30 104.9 16.5 years 43,000,000

4 8.80 94.7 26 years 58,000,000

If the corporate tax rate is 30 percent, what is the aftertax cost of the companys debt?