CoffeeCarts has a cost of equity of $15\mathrm{.}7\%,$ has an effective cost of debt of $3\mathrm{.}7\%,$ and is financed $67\%$ with equity and $33\%$ with debt. What is this firm's WACC?

CoffeeCarts's WACC is

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