please solve a), and b)

a) Find the PP and NPV of the following projects. Assume that the projects' cost of capital (or WACC) is 8%. Project A that costs $200 million is expected to generate $50m in year 1, $80m in year 2, and $100m in year 3. Project B that costs $500 million is expected to generate $85 per year for 10 years. b) Find the IRR of the following projects and make your decision. Assume that the projects' cost of capital (or WACC) is 5%. Project X that costs $800 million is expected to generate $60m per year for 18 years. Is this project acceptable? Project Y that costs $100 million is expected to generate $22m per year for 7 years. Is this project acceptable