Use the following information to answer questions $16$ and $17.$

A corporation has $10,000$ bonds outstanding with an $8\%$ annual coupon rate, $10$ years to maturity, a $$1,000$ face value, and a $$970$ market price. The company's $500,000$ shares of common stock sell for $$45$ per share, have a beta of $1\mathrm{.}5,$ the risk$-$free rate is $5\mathrm{.}5\%,$ and the market risk premium is $7\%.$

$16.$ What is the cost of equity for this corporation?

A$.6\mathrm{.}00\%$

B$.12\mathrm{.}00\%$

C$.16\mathrm{.}00\%$

D$.16\mathrm{.}50\%$

E$.$ none of the above

$17.$ Assuming a $30\%$ tax rate, what is this corporation's after$-$tax cost of debt?

A$.2\mathrm{.}69\%$

B$.4\mathrm{.}48\%$

C$.5\mathrm{.}07\%$

D$.5\mathrm{.}92\%$

E$.$ none of the above