please show excel calculations

Project X requires an initial investment of $1000. The first 3 years the investment has no return (Cfl-0, Cf2=0, Cf3-0). After that you will receive $500 for 4 years (Cf4:Cf7-500). Your Cost of Debt 10%, Cost of Preferred Stock-9%, and Cost of Common Stock = 13%. Currently 50% of your capital is debt, 25% is preferred stock, 25% is common stock. (hint: you must calculate WACC first) Calculate NPV