10-4 A heat exchanger is being installed as part of a plant modernization program....

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10-4 A heat exchanger is being installed as part of a plant modernization program. It costs $80,000, including installation, and is expected to reduce the overall G plant fuel cost by $20,000 per year. Estimates of the useful life of the heat exchanger range from an opti- mistic 12 years to a pessimistic 4 years. The most likely value is 5 years. Assume the heat exchanger has no salvage value at the end of its useful life. (a) Determine the pessimistic, most likely, and opti- mistic rates of return. (b) Use the range of estimates to compute the mean life and determine the estimated before-tax rate of return. 10-4 A heat exchanger is being installed as part of a plant modernization program. It costs $80,000, including installation, and is expected to reduce the overall G plant fuel cost by $20,000 per year. Estimates of the useful life of the heat exchanger range from an opti- mistic 12 years to a pessimistic 4 years. The most likely value is 5 years. Assume the heat exchanger has no salvage value at the end of its useful life. (a) Determine the pessimistic, most likely, and opti- mistic rates of return. (b) Use the range of estimates to compute the mean life and determine the estimated before-tax rate of return

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