Calculate the weighted average cost of capital $($WACC$)$ for a firm that has debt$-$to$-$equity ratio of $1\mathrm{.}5,$ corporate tax rate of $29$ levered cost of equity of $10\mathrm{.}5\%,$ and after$-$tax cost of debt of $6\mathrm{.}1\%.$

Note: Enter the cost of capital in percentage, rounded to the nearest first digit after the decimal point.