pls show calculation method

You are a financial analyst for Langkawi Sdn. Bhd. The director of capital budgeting has asked you to analyse two proposed capital investments, Project Alpha and Project Beta. Each project has a cost of RM15 000, and the cost of capital for each project is 10 percent. The project expected net cash flows are as follows: Year 1 2 3 4 5 Project Alpha RM3,344 RM3,344 RM3,344 RM3,344 RM3,344 Project Beta RMO RM10,000 RM10,000 RM8,500 RM8,000 (a) Calculate each project's payback period, net present value, and profitability index. (b) Which project or project should be accepted if they are independent