The replacement of a laser cutting machine is being considered. The best available machine on market has an estimated economic life of 12 years with an equivalent annual worth of $-22,800 The current used machine, which was bought three years ago for $36,000, has a present market value of $4,000 with the following data for the next three years; OC Year Estimated Market Value S per Year at End of Year, $ 20.000 3.000 23.000 2,500 30,000 2,000 Select when to replace the machine, using Economic Service Life method at an interest rate of 4% per year