Please help urgent!

You work for a Pharma company considering two mutually exclusive drug development projects. Project 1 involves development of a new type of drug. It would cost $50M to develop today, and then produce cash flows of $20M per year for 5 years starting 4 years from today (i.e., there are no cash flows at the end of years 1 through 3, but then cash flows of $20M per year from years 4 through 8). Project 2 involves development of a generic drug, which would cost $25M to develop today, and then produce cash flows of $8M per year for 5 years starting one year from today.

a. What are the IRRs of the two projects?

b. What are the NPVs of the two projects if the discount rate is 10%?

c. Which project should you accept? Can the IRR rule be used to make this decision? Explain.