Ying imports has several bond issues outstanding, each making semiannual interest payments. The bonds are listed in the table below. If the corporate tax rate is 34 percent, what is the aftertax cost of the company's debt?

Bond Coupon Rate Price Quote Maturity Face Value

1 7.5% 105.0 5 Years 20,000,000

2 5.8 95.4 8 Years 40,000,000

3 7.7 103.8 15.5 years 45,000,000

4 8.1 105.7 25 years 60,000,000