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

$\backslash$table$[[$Bond$,$Coupon Rate,Price Quote,Maturity$],[1,8\mathrm{.}90\%,105\mathrm{.}9,3$ years$],[2,6\mathrm{.}40,94\mathrm{.}5,6$ years$],[3,8\mathrm{.}60,104\mathrm{.}7,13\mathrm{.}5$ years$],[4,9\mathrm{.}10,94\mathrm{.}5,23$ years$]]$

If the corporate tax rate is $24$ percent, what is the aftertax cost of the company's debt? Note: Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$

Aftertax cost of debt $$