You were hired as a consultant to Giambono Company, whose market$-$value$-$determined capital structure is $40\%$ debt, $15\%$ preferred equity, and $45\%$ common equity. The after$-$tax cost of debt is $6\mathrm{.}00\%,$ the cost of preferred equity is $7\mathrm{.}50\%,$ and the cost of common equity is $13\mathrm{.}00\%.$ What is its WACC?