Suppose a company currently has some bonds outstanding in the market. The bonds have $10$ years until maturity, they pay a coupon rate of $6\%$ on a semiannual basis. If the company$$s bonds are selling for $$965$ now, and the company$$s tax rate is $40\%,$ what is its after$-$tax cost of debt?

Group of answer choices

$7\mathrm{.}90\%$

$6\mathrm{.}48\%$

$3\mathrm{.}89\%$

$5\mathrm{.}14\%$