Ying Import has several bond issues outstanding, each making semiannual interest payments. The bonds are listed in the following table. If the corporate tax rate is 31 percent, what is the aftertax cost of Ying's debt?

Bond	Coupon Rate	Price Quote	Maturity	Face Value
1	5.6%	103	3 years	$ 22,000,000
2	6.8	109	8 years	42,000,000
3	5.7	99	21 years	41,000,000
4	6.7	112	35 years	64,000,000