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Single Plantwide Rate and Activity-Based Costing Whirlpool Corporation conducted an activity-based costing study of its Evansville,...

  1. Single Plantwide Rate and Activity-Based Costing

    Whirlpool Corporation conducted an activity-based costing study of its Evansville, Indiana, plant in order to identify its most profitable products. Assume that we select three representative refrigerators (out of 333): one low-, one medium-, and one high-volume refrigerator. Additionally, we assume the following activity-base information for each of the three refrigerators:

    Three Representative
    Refrigerators
    Number of
    Machine Hours
    Number of
    Setups
    Number of
    Sales Orders
    Number of
    Units
    Refrigerator—Low Volume 120 21 63 600
    Refrigerator—Medium Volume 310 20 140 1,550
    Refrigerator—High Volume 960 14 210 4,800

    Prior to conducting the study, the factory overhead allocation was based on a single machine hour rate. The machine hour rate was $600 per hour. After conducting the activity-based costing study, assume that three activities were used to allocate the factory overhead. The new activity rate information is assumed to be as follows:


    Machining Activity

    Setup Activity
    Sales Order
    Processing Activity
    Activity rate $580 $900 $200

    a. Complete the following table, using the single machine hour rate to determine the per-unit factory overhead for each refrigerator (Column A) and the three activity-based rates to determine the activity-based factory overhead per unit (Column B). Finally, compute the percent change in per-unit allocation from the single to activity-based rate methods (Column C).

    If required, round all per unit answers to the nearest cent. Round percents to one decimal place. For column C, use the minus sign to indicate a negative or decrease.

    Column A Column B Column C


    Product Volume Class
    Single Rate
    Overhead Allocation
    Per Unit
    ABC
    Overhead Allocation
    Per Unit

    Percent Change in
    Allocation
    Low $ $ %
    Medium $ $ %
    High $ $ %

    b. Why is the traditional overhead rate per machine hour greater under the single rate method than under the activity-based method?

    The machine hour rate is greater under the single rate method than under the activity-based method because 100% of the factory overhead is is allocated by machine hours under the single rate method. However, only a portion of the factory overhead is allocated under the machine rate method using activity-based costing. The remaining factory overhead is allocated using the . Thus, the numerator for for determining the machine hour rate under activity-based costing must be less than the numerator under the single machine hour rate method.

    c. Interpret Column C in your table from part (A).

    Column C indicates that under activity-based costing the low-volume product has a per-unit cost than calculated under the single rate method. In contrast, under activity-based costing the high-volume product has a per-unit cost than calculated under the single rate method. This result will occur when there are activities that occur in proportions different from their volumes. In this case, volume products have setups and sales orders occurring in higher proportions of total setups and sales orders than their proportion of machine hours to total machine hours. The opposite is the case for the volume product. Thus, the lower-volume products are produced and ordered in batch sizes compared to the higher-volume product. This implies that Whirlpool may wish to simplify its product line by eliminating some of the volume products or by attempting to reduce the overall cost of setup and sales order processing activities.

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