Pfd Company has debt with a yield to maturity of $7\mathrm{.}8\%,$ a cost of equity of $15\mathrm{.}2\%,$ and a cost of preferred stock of $8\mathrm{.}9\%.$ The market values of its debt, preferred stock, and equity are $$9\mathrm{.}7$ million, $$3\mathrm{.}2$ million, and $$15\mathrm{.}1$ million, respectively, and its tax rate is $22\%.$ What is this firm's after$-$tax WACC?

Note: Assume that the firm will always be able to utilize its full interest tax shield.

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