Assume that a company's planned level of activity wat 3,500 units and its actual level of activity was 4,000 units. The spending variance for one of its mixed expenses was $900 favorable and its activity variance was $200 unfavorable. The planned and actual amounts of the fored portion of this mixed expense were $10,000 and $9,300, respectively. What is the octual total amount of this mixed expense? Multiple Choice $12,500 $11,400 $11.200 510700