Sheridan Specialties just purchased inventory-management computer software at a cost of $1,669,950. Cost savings from the investment over the next six years will produce the following cash flow stream: $211,340, $273,240, $444,600, $623,250, $740,320, and $472,740. What is the payback period on this investment? (Round answer to 2 decimal places,e.g. 15.25.)