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The assistant is unsure how to classify the utilities costs in the Radiology Department because these costs do not exhibit either strictly variable or fixed cost behavior. Utilities costs are very high in the department due to a CAT scanner that draws a large amount of power and is kept running at all times. The scanner can’t be turned off due to the long warm-up period required for its use. When the scanner is used to scan a patient, it consumes an additional burst of power. The assistant has accumulated the following data on utilities costs and use of the scanner since the first of the year.
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Month
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Number of Scans
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Utilities
Cost
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January
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140
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$5,600
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February
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120
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$4,600
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March
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110
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$4,500
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April
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130
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$5,100
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May
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210
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$7,400
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June
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200
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$7,000
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July
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100
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$5,400
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August
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90
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$4,600
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September
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80
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$4,800
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October
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70
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$3,200
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The chief administrator has informed her assistant that the utilities cost is probably a mixed cost that will have to be broken down into its variable and fixed cost elements by use of a scattergraph. The assistant feels, however, that if an analysis of this type is necessary, then the high-low method should be used, since it is easier and quicker. The controller has suggested that there may be a better approach.
Required:
1.Using the high-low method, estimate a cost formula for utilities. Express the formula in the form Y = a + bX. (The variable rate should be stated in terms of cost per scan.)
2.Prepare a scattergraph by plotting the number of scans and utility cost on a graph.
Instructions:
1. On the graph below, use the point tool (Jan) to plot utilities cost on the vertical axis and the number of scans on the horizontal axis.
2. Repeat the same process for the plotter tools (Feb, Mar, Apr, May, June, July, Aug, Sep, Oct).
3. To enter exact coordinates, click on the point and enter the values of x and y.
4. To remove a point from the graph, click on the point and select delete option.
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