This is all the information given by the instructor.

3) You are considering the following mutually exclusive projects: Co . C2 C3 A: -20,000 +9,000 +9,000 +9,000 B: -20,000 0 0 +30,000 a. What are the IRR's of each project? b. Draw the NPV profile (NPV on the y-axis, discount rate on the x-axis) for each project c. For what discount rates do you prefer A over B