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    Solving word problems in cost comparisons using oil prices.

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    Fuel oil prices averaged $0.93375 in the winter of 1998, then shot up to $1.02 in
    winter 1999. Calculate the additional fuel costs for a household that used 863 5/8
    gallons of fuel oil during the winter of 1999.

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    Solution Preview

    The change in the rate of oil price is given by the difference ...

    Solution Summary

    Cost comparisons are solved for using a variable.