A company is $47\%$ financed by risk$-$free debt. The interest rate is $12\%,$ the expected market risk premium is $10\%,$ and the beta of the company's common stock is $0\mathrm{.}57.$ What is the after$-$tax WACC, assuming that the company pays tax at a $30\%$ rate? $($Do not round intermediate calculations. Enter your answer as a percent rounded to $2$ decimal places.$)$