Your company is seriously considering investing in a new project opportunity, but cash flow is tight. Top management is concerned about how long it will take for this new project to pay back the initial investment of $50,000. You have determined that the project should generate inflows of $30,000, $30,000, $40,000, $25,000, and $15,000 for the next five years. Your firm has required a rate of return of 15%. How long will it take to pay back the initial investment?