AA corporation has a capital structure consisting of 40% debt, 10% preferred stock, and 50% common equity. Assume the firm has a sufficient retained earnings to fund the equity portion of its capital budget. It has 20-year, 14% semiannual coupon bonds that sell at their par value of $1,000. The firm could sell, at par, $50 preferred stock that pays a 8% annual dividend. AAs beta is 1.4, the risk-free rate if 5%, and the market risk premium is 8%. AA is a constant growth firm that just paid dividend of $1.00, sells for $20.00 per share, and has a growth rate of 10%. AAs tax rate is 30%. what is AAs WACC?

i need specific calculation process for this question, not only the answer!!