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13 July, 22:05

An environmental engineer is considering three methods for disposing of a nonhazardous chemical sludge: land application, fluidized-bed incineration, and private disposal contract. The estimates for each method are below. (a) Determine which has the least cost on the basis of an annual worth comparison at 10% per year. (b) Determine the equivalent present worth value of each alternative using its AW value

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  1. 13 July, 22:12
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    The annual worth of land application = $ 110,000 (A/P, 10%, 5 years) + $ 95,000 - $ 15,000 (A/F, 10%, 5 years)

    The annual worth of land application = $ 110,000 X 0.263797 + $ 95,000 - $ 15,000 X 0.163797

    The annual worth of land application = $ 29,017.54 + $ 95,000 - $ 2,456.95

    The annual worth of land application = $ 121,560.59

    The annual worth of land Incineration = $ 800,000 (A/P, 10%, 6 years) + $ 60,000 - $ 250,000 X (A/F, 10%, 6 years)

    The annual worth of land Incineration = $ 800,000 X 0.229607 + $ 60,000 - $ 250,000 X 0.129607

    The annual worth of land Incineration = $ 211,283.85

    The annual worth of contract = $ 190,000

    The annual worth of contract = $ 190,000

    The land application has the least cost, hence it is preferred.
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