A machine was bought 12 years ago. Since ten year depreciation was used, the machine’s book value turns to be zero now. A new machine is being considered to replace this machine. In the case of buying the new machine, the seller would take the existing machine out without any expenses. The new machine’s cost is 250,000 baht and the machine life and salvage value are expected to 10 years and zero. By using the new machine, it is expected to have revenue increased by 20,000 baht per year and expenditure decreased by 10,000 baht per year. The straight-line method is used to calculate depreciation. Should the existing machine be replaced by the new machine if tax rate is 40% and after-tax MARR is 5% per year?