ABC Inc. borrows money at $9\%,$ sells bonds at $7\%,$ and the purchasers of common stock require $13\%$ rate of return. If the company has borrowed $$40$ million, sold $$60$ million in bonds, and sold $$100$ million worth of common stocks, what is the Weighted Average Cost of Capital $($WACC$)?$

Enter the answer as a percentage. For example $12\mathrm{.}34\%$ is $12\mathrm{.}34.$ Enter $2$ decimal places. Do not enter the percentage symbol.