Mojo Mining has a bond outstanding that sells for $$2,138$ and matures in $16$ years. The bond pays semiannual coupons and has a coupon rate of $6\mathrm{.}82$ percent. The par value is $$2,000.$ If the company's tax rate is $21$ percent, what is the aftertax cost of debt?

Multiple Choice

$3\mathrm{.}55\%$

$4\mathrm{.}08\%$

$4\mathrm{.}85\%$

$5\mathrm{.}89\%$

$6\mathrm{.}31\%$