$(10$ points$)$ The company's target capital structure is $30\%$ debt, $5\%$ preferred stock, and

$65\%$ common stock. It is currently financed with $$300$ mil with debt, $$50$ mil with

preferred stock, and $$250$ mil with common stock. Its stated tax rate is $25\%,$ with the cost

of debt at $6\%,$ cost of preferred stock of $5\mathrm{.}8\%,$ and cost of common stock of $12\%.$

Calculate its overall cost of capital, WACC.