Assume that a company's planned level of activity was 2,000 units and its actual level of activity was 2,200 units. The spending variance for one of its variable expenses was $800 unfavorable and its activity variance was $1,000 unfavorable. What cost formula does the company use for this expense? Multiple Choice $3.00 per unit $4.00 per unit $5.00 per unit $6.00 per unit