To help finance a major expansion, Large Hadron Company sold a noncallable bond $10$ years ago that now has $15$ years to maturity. This bond has a $7\mathrm{.}25\%$ annual coupon, paid semiannually, sells at a price of $$1,125,$ and has a par value of $$1,000.$ If the firm's tax rate is $35\%,$ what is the component $($post$-$tax$)$ cost of debt for use in the WACC calculation?

Group of answer choices

$4\mathrm{.}71\%$

$6\mathrm{.}25\%$

$5\mathrm{.}97\%$

$4\mathrm{.}06\%$

$3\mathrm{.}88\%$