Assume that a company's planned level of activity was 3,500 units and its actual level of activity was 4,000 units. The spending variance for one of its mixed expenses was $1,050 favorable and its activity variance was $200 unfavorable. The total amount of this mixed cost included in the planning budget was $12,000. What is the actual total amount of this mixed expense? $11,550 O $11,150 $10,750 O $12,950