Mojo Mining has a bond outstanding that sells for $$1,040$ and matures in $18$ years. The bond pays semiannual coupons and has a coupon rate of $5\mathrm{.}54$ percent. The par value is $$1,000.$ If the company's tax rate is $21$ percent, what is the aftertax cost of debt?

Multiple Choice

$5\mathrm{.}29\%$

$3\mathrm{.}64\%$

$4\mathrm{.}10\%$

$3\mathrm{.}17\%$

$4\mathrm{.}94\%$