A company's $7\%$ coupon rate, semiannual payment, $$1,000$ par value bond that matures in $25$ years sells at a price of $$516\mathrm{.}97.$ The company's federal$-$plus$-$state tax rate is $25\%.$ What is the firm's after$-$tax component cost of debt for purposes of calculating the WACC? $($Hint: Base your answer on the nominal rate.$)$ Round your answer to one decimal place.