CoffeeCarts has a cost of equity of $15\mathrm{.}0\%,$ has an effective cost of debt of $4\mathrm{.}0\%,$ and is financed $70\%$ with equity and $30\%$ with debt. What is this firm's WACC?

CoffeeCarts's WACC is

$\%.($Round to one decimal place.$)$