Suppose that MNINK Industries' capital structure features 63 percent equity, 7 percent preferred stock, and 30 percent debt. Assume the before-tax component costs of equity, preferred stock, and debt are 11.60 percent, 9.50 percent, and 9 percent, respectively. What is MNINK'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