Define replacement analysis

What two cost categories form the trade off that leads to an optimum replacement interval? a. Direct costs and indirect costs b. Insider costs and outsider costs c. Operating & maintenance costs and capital recovery costs d. Sunk costs and opportunity costs.

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A machine that cost $120,000 3 years ago can be sold now for $51,500. Its market value is expected to be $40,000 and $20,000 1 year and 2 years from now, respectively. Its operating cost was $18,000 for the first 3 years of its life, but the M&O cost is expected to be $23,000 for the next 2 years. A new improved machine that can be purchased for $135,500 will have an economic life of 5 years, and an operating cost of $9,000 per year, and a salvage value of $32,000 whenever it is replaced. At an interest rate of 10% per year, determine if the presently owned machine should be replaced now, 1 year from now, or 2 years from now. The annual worth of the existing machine one year from now is $- 50500 O. the annual worth of the existing machine two years from now is $- 30,500 . and the annual worth of the new machine is $-112,500 The presently owned machine should be replaced now 13