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%	105.2	7 years	$22,000,000
2	7.00	95.2	10 years	42,000,000
3	8.40	104.0	17.5 years	47,000,000
4	8.90	105.9	27 years	62,000,000

If the corporate tax rate is 22 percent, what is the aftertax cost of the companys debt? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.)