Cold Goose Metal Works $($CGMW$)$ can borrow funds at an interest rate of $11\mathrm{.}10\%$ for a period of eight years. Its marginal federal$-$plus$-$state tax rate is $40\%.$ CGMW$\text{'}$s after$-$tax cost of debt is $($rounded to two decimal places$).$

$6\mathrm{.}33\%$

$11\mathrm{.}10\%$

$6\mathrm{.}66\%$

$7\mathrm{.}33\%$