A project has an initial cost of I, has a required return of r, and pays C annually for N years.

a. Find C in terms of I and N such that the project has a payback period equal to its life.

b. Find C in terms of I, N, and r such that this is a profitable project according to the NPV decision rule.

c. Find C in terms of I, N, and r such that the project has a benefit-cost ratio of 2.