Filer Manufacturing has $4,093,637$ shares of common stock outstanding. The current share price is $$57\mathrm{.}92,$ and the book value per share is $$6\mathrm{.}77.$ Filer Manufacturing also has two bond issues outstanding. The first bond issue has a face value of $$48,359,541,$ has a $0\mathrm{.}05$ coupon, matures in $10$ years and sells for $83$ percent of par. The second issue has a face value of $$46,912,531,$ has a $0\mathrm{.}06$ coupon, matures in $20$ years, and sells for $92$ percent of par.

The most recent dividend was $$2\mathrm{.}81$ and the dividend growth rate is $0\mathrm{.}06.$ Assume that the overall cost of debt is the weighted average of that implied by the two outstanding debt issues. Both bonds make semiannual payments. The tax rate is $0\mathrm{.}22.$

What is Filer's aftertax cost of debt? Enter the answer with $4$ decimals $($e$.$g$.0\mathrm{.}2345)$