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Nano Specialist is considering an upgrade project. The estimated cash flows from the upgrade project appear below. What is the project's payback period? Note that year 0 and year 1 cash flows are negative. (Answer in years, round to 2 places) Year 0 cash flow =78,000 Year 1 cash flow =41,000 Year 2 cash flow =23,000 Year 3 cash flow =36,000 Year 4 cash flow =33,000 Year 5 cash flow =42,000 Year 6 cash flow =32,000 Year 7 cash flow =39,000