(NPV with varying required rates of return​) Gubanich Sportswearis considering building a new factory to produce aluminum baseballbats. This project would require an initial cash outlay of​$4,000,000 and would generate annual free cash inflows of​$1,000,000 per year for 7 years. Calculate the​ project's NPV​given:
a. A required rate of return of 9 percent
b. A required rate of return of 11 percent
c. A required rate of return of 15 percent
d. A required rate of return of 16 percent