MGM Resorts's cost of equity is 14 percent and its aftertax cost of debt is 7 percent. What is the firm's weighted average cost of capital if its debt-equity ratio is 0.5 and the tax rate is 25 percent? \begin{tabular}{c} \hline 7.1% \\ \hline 8.2% \\ \hline 10.4% \\ \hline 9.3% \\ \hline \end{tabular}