Pfd Company has debt with a yield to maturity of $5\mathrm{.}5\%,$ a cost of equity of $12\mathrm{.}7\%,$ and a cost of preferred stock of $10\mathrm{.}3\%.$ The market values of its$$ debt, preferred$$ stock, and equity are $ $10\mathrm{.}3$million$,$ $ $3\mathrm{.}4$million$,$ and $ $16\mathrm{.}9$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.