(MIRR calculation) Artie's Wrestling Stuff is considering building a new plant. This plant would require an initial cash outlay of $7 million and would generate annual free cash inflows of $3 million per year for 8 years. Calculate the project's MIRR given:

a. A required rate of return of 8 percent

b. A required rate of return of 13 percent

c. A required rate of return of 15 percent