Problem $14-22$ Calculating the Cost of Debt $[$LO$2]$

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 $21$ percent, what is the aftertax cost of the company's debt?

$($Do not round intermediate calculations and enter your answer as a percent rounded

to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$