Ying Import has several bond issues outstanding, each making semiannual interest payments. The bonds are listed in the following table.

Bond		Coupon Rate				Price Quote				Maturity			Face Value
1			6.9	%			106.86			5	years		$	49,000,000
2			8.4				115.42			8	years			44,000,000
3			8.1				113.97			15.5	years			64,000,000
4			7.7				103.21			25	years			71,000,000

If the corporate tax rate is 24 percent, what is the aftertax cost of the companys debt? (Do not round intermediate calc

I have tried, and the answer is not 6.45%