Northern Specialties just purchased inventory-management computer software at a cost of $1,578,950. Cost savings from the investment over the next six years will produce the following cash flow stream: $232,340, $337,240, $319,600, $598,250, $805,320, and $647,740. What is the payback period on this investment? (Round answer to 2 decimal places,e.g. 15.25.)