# Five years ago, a multi-axis N

Five years ago, a multi-axis NC machine was purchased for the express purpose of machining large, complex parts used in commercial and military aircraft worldwide. It cost \$350,000, had an estimated life of 15 years, and O&M costs of \$50,000 per year. It was originally thought to have a salvage value of \$20,000 at the end of 15 years but is now believed to have a remaining life of 5 years with no salvage value at that time. With business booming, the existing machine is no longer sufficient to meet production needs. It can be kept and supplemented by purchasing a new, smaller Machine S for \$210,000 that will cost \$37,000 per year for O&M, have a life of 10 years, and a salvage value of \$210,000(0.8t) after t years. As an alternative, a larger, faster, and more capable Machine L can be used alone to replace the current machine. It has a cash price without trade-in of \$450,000, O&M costs of \$74,000 per year, a salvage value of \$450,000(0.8t) after t years, and a 15-year life. The present machine can be sold on the open market for a maximum of \$70,000. MARR is 20% and the planning horizon is 5 years. Solve, a. Clearly show the cash flow profile for each alternative using a cash flow approach (insider’s viewpoint approach). b. Using an EUAC comparison and a cash flow approach, decide which is the more favorable alternative. c. Clearly show the cash flow profile for each alternative using an opportunity cost approach (outsider’s viewpoint approach). d. Using an EUAC comparison and an opportunity cost approach, decide which is the more favorable alternative.

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