its financial management question. kindly answer soon

Dawood & Co is financed with debt, preferred equity, and common equity with market values of $ 30 million, $20 million, and $40 million, respectively. Th e betas for the debt, preferred stock, and common stock are 0.3, 0.7, and 1.3, respectively. If the risk-free rate is 2.95 percent, the market risk premium is 6.0 percent, and Dawood & Co average and marginal tax rates are both 30 percent, what is the companys weighted average cost of capital?