A firm has 10000 bonds outstanding, selling at 97%, the bonds have 7 years to maturity, and pay 8% semi annual coupons. The firm has 25000 preferred shares and 500000 common outstanding. The preferred shares yield 9% and sell at par. The commons currently pay quarterly dividends of $0.25, and the growth rate of dividends is estimated to be 4%. the common shares are selling for $13.60. the corporate tax rate is 30%. what is the WACC of the firm?