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 33 percent, what is the aftertax cost of Ying's debt?

Bond	Coupon Rate	Price Quote	Maturity		Face Value
1	5.8%	100	5	years	$ 23,000,000
2	7.1	109	8	years	39,000,000
3	5.7	101	18	years	42,000,000
4	6.3	116	31	years	64,000,000