Jabroni Co$.$ has $8$ percent coupon bonds outstanding that mature in $15$ years. The bonds pay interest semiannually and have a face value of $$1,000.$ Currently, the bonds are selling for $$950$ each. What is the company$$s pre$-$tax cost of debt?

$7\mathrm{.}78$ percent

$5\mathrm{.}46$ percent

$8\mathrm{.}60$ percent

$4\mathrm{.}30$ percent