Assume that the cost formula for one of a company's mixed expenses is $10,000+ $4.00 per unit. The company's planned level of activity was 2,000 units and its actual level of activity was 2,200 units. The actual amount of this expense was $18,200. The spending variance for this expense is: Multiple Choice $600 F. $1,600 U. $200 U. $1,600 F