McConnell Corporation has bonds on the market with $15$ years to maturity, a YTM of $10\mathrm{.}0$ percent, a par value of $$1,000,$ and a current price of $$1,276\mathrm{.}50.$ The bonds make semiannual payments. What must the coupon rate be on these bonds? $21\mathrm{.}36\%$

$13\mathrm{.}60\%$

$13\mathrm{.}70\%$

$27\mathrm{.}27\%$

$10\mathrm{.}65\%$