What is the firms weighted average cost of capital wacc1 if

Question

Barton Industries expects that its target capital structure for raising funds in the future for its capital budget will consist of 40% debt, 5% preferred stock, and 55% common equity. Note that the firm's marginal tax rate is 40%. Assume that the firm's cost of debt, r_d, is 8.5%, the firm's cost of preferred stock, r_p, is 8% and the firm's cost of equity is 12.5% for old equity, r_s, and 13.12% for new equity, r_e. What is the firm's weighted average cost of capital (WACC₁) if it uses retained earnings as its source of common equity?