Sinner Service Inc. $($SSI$)$ has the following $2,$ semi$-$annual coupon bond issues outstanding:

Bond Coupon Rate Price Quote Maturity Face Value

$18\%97\mathrm{.}655\mathrm{.}5$ years $$900,000$

$27\%102\mathrm{.}5510$ years $$500,000$

If the corporate tax rate is $35\%,$ what is the after$-$tax cost of debt for SSI.?