Russell Corp. is considering the purchase of a new machine for $76,000. The machine would generate an annual cash flow of $23,214 for five years. At the end of five years, the machine would have no salvage value. The companys cost of capital is 12 percent. The company uses straight-line depreciation with no mid-year convention. What is the payback period in years for the machine approximated to two decimal points, assuming no taxes are paid?