Pfd Company has debt with a yield to maturity of $5\mathrm{.}6\%,$ a cost of equity of $13\mathrm{.}1\%,$ and a cost of preferred stock of $8\mathrm{.}9\%.$ The market values of its debt, preferred stock, and equity are $$13\mathrm{.}4$ million, $$3\mathrm{.}1$ million, and $$13\mathrm{.}5$ million, respectively, and its tax rate is $40\%.$ What is this firm's after$-$tax WACC?

What Pfd$\text{'}$s WACC? $($Round to two decimal places.$)$