Assume that a company’s planned level of activity was3,500 units and its actual level of activity was 4,000 units. The spending variance for one of its mixed expenses was $450 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?

A) 11350

B) 11750

C) 13550

D) 12150