Steve has $7,000$ and he borrows $3,000,$ so that he can pay $10,000$ for a $15-$year bond with a par value of $10,000$ and $10\%$ coupons paid monthly.The loan for $3,000$ is a $15-$year, interest$-$only loan, requiring that he make interest payments at the end of each month at a nominal rate of $8\%$ convertible monthly. At the end of $15$ years, he repays the loan in full.Calculate the annual effective yield that Steve will realize on his $7,000$ over the $15-$year period.A$10\mathrm{.}5\%$B$11\mathrm{.}4\%$C$12\mathrm{.}7\%$D$14\mathrm{.}0\%$E$15\mathrm{.}2\%$