Assume that a company provided the following cost formulas for three of its expenses (where a refers to the number of hours worked): Rent (fixed) Supplies (variable) Utilities (mixed) $3,000 $4.000 $150 + $0.750 The company's planned level of activity was 2,000 hours and its actual level of activity was 1,935 hours. The actual amount of supplies expense for the period was $7,800. What is the activity variance for supplies expense? Multiple Choice $200 U $200 F $260 F $260 U