Problem 1: If you invest $73,300 in a project which yields an annual return of $17,500, how many years will it take to recover your investment if the annual interest rate is 4.5%?

Problem 2: The capital cost of a certain project is $625,000 and the annual expenses are $33,000. If the study period is 9 years, what is the present worth of this investment assuming 7.25% interest rate?