Pfd Company has debt with a yield to maturity of $6\mathrm{.}6\%,$ a cost of equity of $13\mathrm{.}6\%,$ and a cost of preferred stock of $9\mathrm{.}9\%.$

The market values of its debt, preferred stock, and equity are $$15\mathrm{.}1$ million, $$2\mathrm{.}8$ million, and $$14\mathrm{.}9$ million, respectively,

and its tax rate is $21\%.$ 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.$)$