Suppose that B2B, Inc. has a capital structure of 35 percent equity, 16 percent preferred stock, and 49 percent debt. Assume the before-tax component costs of equity, preferred stock, and debt are 13.5 percent, 9.0 percent, and 8.5 percent, respectively. What is B2Bs WACC if the firm faces an average tax rate of 21 percent and can make full use of the interest tax shield?