Tobin's Barbeque has a bank loan at $12\%$ interest and an after$-$tax cost of debt of $4\%.$ What will the after$-$tax cost of debt be when the loan is due if a new loan is taken out yielding $12\%.$

Note: Do not round intermediate calculations. Round your answer to $2$ decimal places.

Multiple Choice

$4\mathrm{.}00\%$

$9\mathrm{.}05\%$

None of these options are true.

$1\mathrm{.}45\%$