The expected return on a firm's equity is $8\%,$ and the firm has a yield to maturity on its debt of $4\%.$ Debt accounts for $20\%,$ common equity for $78\%$ and preferred equity for $2\%$ of the firm's total market value. If its tax rate is $30\%,$ and the cost of preferred equity is $20\%,$ what is this firm s WACC? Express your answers in strictly numerical terms. For example, if the answer is $5\%,$ write $0\mathrm{.}05"$