Train Express Co. ,which manufactures train engines,is attempting to predict its maintenance costs more accurately.Maintenance costs are a mixed cost.Maintenance costs and machine hours for the first four months of the year are as follows:

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The Answer of Train Express Co. ,which manufactures train engines,is attempting to predict its maintenance costs more accurately.Maintenance costs are a mixed cost.Maintenance costs and machine hours for the first four months of the year are as follows: