Apex Corp. is planning to buy a production machine costing $100.000. Th. machine's expected useful life is five years, with no residual value. Apex uses a discount rate of 10% and has calculated the following data pertaining to the purchase and operation of this machine: Year Estimated Annual Net Cash Inflow 1 $60,000 2 $30,000 3 $20,000 4 $20,000 5 $20,000 What is the payback period for this investment? 2.50 years 3.00 years. 2.75 years. 5.00 years