Temple$-$Midland, Inc. is issuing a $$$$1,000$ par value bond that pays $8\mathrm{.}2\%$ annual interest and matures in $15$ years. Investors are willing to pay $$$$954$ for the bond and Temple faces a tax rate of $18\%.$ What is$$ Temple's after$-$tax cost of debt on the$$ bond?

The$$ after$-$tax cost of debt is $\_\_\_\_\_\_\_\_\%.($Round to two decimal$$ places.$)$