Can someone show me the formular for these, and what buttons to push on a financial calculator please? Thank you!

Question #1 (23 points),Consider the following cash flows for projects A and B Year Project A (S1000) 100 600 800 900 900 Project B (81000) 900 700 500 300 300 2 4 The cost of capital (discount rate r) for both projects is 10% a. Find the NPV, IRR, and Profitability Index (PI) of projects A and B. If projects A and B are mutually exclusive, which project would you select? N PV PT 1361374-1000