"The FIN$340$ Company bonds are current trading at $84\%$ of par $($Par Value is $$1,000)$ with exactly $7$ years remaining until maturity and a $2\mathrm{.}4\%$ coupon rate; The company's tax rate is $21\mathrm{.}0\%.$ What is the company's After$-$Tax Cost of Debt?"

$4\mathrm{.}07\%$

$5\mathrm{.}15\%$

$2\mathrm{.}40\%$

$1\mathrm{.}90\%$

$6\mathrm{.}23\%$

$6\mathrm{.}08\%$

$6\mathrm{.}17\%$