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8.24 The manager of a canned-food processing plant has two labeling machine options. On the basis of a rate of return analysis with a MARR of 20% per year, determine (a) which model is economically better, and (b) if the selection changes, provided both options have a 4-year life and all other esti- mates remain the same. Model First cost, AOC, $ per year Salvage value, $ Life, years 105 - 15,000 -1.600 3.000 2 200 -25,000 -400 4,000 4 8.24 The manager of a canned-food processing plant has two labeling machine options. On the basis of a rate of return analysis with a MARR of 20% per year, determine (a) which model is economically better, and (b) if the selection changes, provided both options have a 4-year life and all other esti- mates remain the same. Model First cost, AOC, $ per year Salvage value, $ Life, years 105 - 15,000 -1.600 3.000 2 200 -25,000 -400 4,000 4