Northern Specialties just purchased inventory-management computer software at a cost of $1,684,950. Cost savings from the investment over the next six years will produce the following cash flow stream: $251,340, $221,240, $455,600, $493,250, $745,320, and $553,740. What is the payback period on this investment? (Round answer to 2 decimal places,e.g. 15.25.)