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A sorority held a party. The sorority prepared the following budget for 25 expected attendees: Room rental $270 Food 250 Entertainment 150 Decorations 75 Total Costs $645 Twenty-five people attended the party. The costs incurred were: Room rental $250 Food 370 Entertainment 125 Decorations 75 Total Costs $660 Using the management-by-exception rule, which of the above costs deserves further examination? What type of cost is depreciation expense of factory building? Direct or indirect Variable or fixed