please calculate one by one and dont use a table. tq

Grey Berhad target capital structure is 25 % debt, 10 % preferred stock, and 65 % common stock. Assume that the firm's after-tax yield to maturity on its bond is 6%, and that the investors require a 7.5 %t return on Grey preferred stock and a 15 % return on its common stock. What is Grey Berhad's weighted average cost of capital (WACC)