Theta Corporation is considering replacing an old machine with a new machine that costs $702,000, has a 9 year useful life and a $40,000 salvage value at the end of its life. If the new machine is purchased, the old machine will be sold immediately for its salvage value of $72,000. Annual cash inflows related to the new machine are $170,000 and will occur evenly throughout the years. The payback period of the new machine is closest to: 3.71 years 3.89 years 4.54 years 4.13 years