Apple has a six$-$year bond outstanding with a $3$ percent coupon. Interest are paid semi$-$annually. The face value of the bond is $$1,000.$ This bond is currently selling for $92$ percent of its face value. The corporate tax rate is $21\%.$ What is the Apple's post$-$tax cost of debt?

Question options:

$2\mathrm{.}27\%$

$4\mathrm{.}54\%$

$3\mathrm{.}59\%$

$7\mathrm{.}19\%$