A machine was bought 3 years ago for $20,000. SL depreciation has been used with B=$20,000, N=4years, S=$0. A replacement is been considered. A new machine can be bought for $16,000 to replace the old one. DDB depreciation will be used for the new machine with B=$16,000, N=4 years, S=$0. The new machine will be used for 2 years and then can be sold for $12,000. The new machine will save $5,000/yr in operation cost. The old machine can be sold for $4,000 right now, or kept in use for 2 more years and then will be sold for $1,000. Incremental combined tax rate is 50%, after-tax MARR is 10%. Calculate ∆PW of the replacement

ENGR.ECONOMIC ANALYSIS
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Chapter1: Making Economics Decisions
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A machine was bought 3 years ago for $20,000. SL depreciation has been used with B=$20,000, N=4years, S=$0. A replacement is been considered. A new machine can be bought for $16,000 to replace the old one. DDB depreciation will be used for the new machine with B=$16,000, N=4 years, S=$0. The new machine will be used for 2 years and then can be sold for $12,000. The new machine will save $5,000/yr in operation cost. The old machine can be sold for $4,000 right now, or kept in use for 2 more years and then will be sold for $1,000. Incremental combined tax rate is 50%, after-tax MARR is 10%. Calculate ∆PW of the replacement.

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