Can anyone please help me answer these questions

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 =-85,000 Year 1 cash flow =-55,000 Year 2 cash flow = 1 1,000 Year 3 cash flow = 41,000 Year 4 cash flow 30,000 Year 5 cash flow = 25,000 Year 6 cash flow- 23,000 Year 7 cash flow 40,000 Answer: Check