A machine purchased three years ago for $720,000 has a current book value using straight-line depreclation of $400,000; its operating expenses are $60.000 per year. A replacement machine would cost $480,000, have a useful life of nine years, and would require $26,000 per year in operating expenses. It has an expected salvoge value of $130,000 after nine years, The current disposal value of the old machine is $170,000; if it is kept 9 more years, its residual value would be $20,000. Required Calculate the total costs in keeping the old machine and purchase a new machine. Should the old machine be replaced