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Assume that a company provided the following cost formulas for three of its expenses (where q refers to the number of hours worked): Rent (fixed) Supplies (variable) Utilities (mixed) $3,000 $4.000 $150 + $0.759 The company's planned level of activity was 2,000 hours and its actual level of activity was 1,900 hours. The actual amount of supplies expense for the period was $7,800. What is the activity variance for supplies expense