Please answer all I need help with all of them

I. Debreu Beverages has an optimal capital structure that is 50% common equity, 40% debt, and 10% preferred stock. Debreu's pretax cost of equity is 12%. Its pretax cost of preferred equity is 7%, and its pretax cost of debt is also 7%. If the corporate tax rate is 35%, what is the weighted average cost of capital? A. between 7% and 8% B. between 8% and 9% C. between 9% and 10% D. between 10% and 12% 2. Using the constant growth model, a firm's expected (D dividend yield is 3% of the stock price, and its growth rate is 7%. If the tax rate is 35%, what is the firm's cost of equity? A. 10% B. 6.65% C. 8.95% D. More information is required 3. Expected cash dividends are $2.50, the dividend yield is 6%. flotation costs are 4% of price, and the growth rate is 3%. Compute cost of new common stock. A. 9.00% B. 9.25% C. 9.18% D. 9.44% 4, A firm's stock is selling for $85. The dividend yield is 5%. A 7% growth rate is expected for the common stock. The firm's tax rte is 32%. What is the firm's cost of retained earnings? A. 8.16% B. 12.00% C. 12.35% D. can not be determined. 5, Firm X has a tax rte of 30%. The price of its new preferred stock is S63 and its flotation cost is $3.15. The cost of new preferred stock is 12%. What is the firm's preferred dividend? A. $7.18 B. S5.03 C. $7.56 D. none of these