Please Help! Need to know formulas for these!

For this problem, assume that Taylor is considering investing in one or more of the following projects: Project A: Expand the manufacturing facility to increase capacity by 20 percent. This investment is expected to cost $360,000 and generate net cash flow of $80,000 per year for the next eight years. Project B: Overhaul the company website to optimize the user experience and generate more traffic from online advertising. This project would cost $200,000 and is expected to generate an additional $100,000 in sales for the next 10 years. Assume that the contribution margin is 42 percent and that there would be no increase in fixed costs, including depreciation. Project C : Invest in solar panels and more fuel-efficient delivery vehicles to reduce operating expenses (e.g., electricity and fuel) and the company's carbon footprint. The initial investment in assets would be $360,000, which would be depreciated over five years. The investment is expected to increase net income by $18,000 per year, after the depreciation adjustment. Required: 1. Compute the payback period for each project. Note: Round your answer to 1 decimal place. 2. Compute the NPV of each project assuming the cost of capital is 10 percent. Note: Round your PV amounts to 4 decimal places. 3. Compute the profitability index of each project. Note: Round your answer to 2 decimal places