Suppose that B$2$B$,$ Incorporated has a capital structure of $37$ percent equity, $18$ percent preferred stock, and $45$ percent debt. Assume the before$-$tax component costs of equity, preferred stock, and debt are $14\mathrm{.}5$ percent, $11\mathrm{.}0$ percent, and $9\mathrm{.}5$ percent, respectively.

What is B$2$B$$s WACC if the firm faces an average tax rate of $21$ percent and can make full use of the interest tax shield?

Note: Round your answer to $2$ decimal places.