The answer to this question is A. 5.20 years. Can you please give a clear written out demonstration on how the answer is 5.20 years? Not sure how to calculate a payback period.

27. What is the payback period for a project with an initial investment of $190,000 that provides an annual cash inflow of $40,000 per year for the first four years, $25,000 per year for years five through seven, and $50,000 per year for years eight and nine? a. 5.20 years b. 5.80 years c. 5.40 years d. 5.59 years