Galvatron Metals has a bond outstanding with a coupon rate of $5\mathrm{.}7$ percent and semiannual payments. The bond currently sells for $$943$ and matures in $19$ years. The par value is $$1,000$ and the company's tax rate is $21$ percent. What is the company's aftertax cost of debt?

Multiple Choice

$3\mathrm{.}11\%$

$4\mathrm{.}01\%$

$4\mathrm{.}91\%$

$2\mathrm{.}90\%$

$3\mathrm{.}50\%$