$($ WACC$)$ Margo Corporation is a major producer of lawn care products. Its stock currently sells for $$52$ per share; there are $10\mathrm{.}5$ million shares outstanding. It has debt with a book value of$$400$ million. Margo bonds yield $64\%$ and trade at $100\%$ of face value. Bonds mature in $10$ years. The risk$-$free rate is $8\%,$ the market risk premium is $9\%$ and Margo has a beta equal to $1.$ The tax rate is $15\mathrm{.}4\%.$The WACC is $\_\_\_\_\_\_\_\_\_\_\_\%.$