Priority Company, which applies overhead to production on the basis of machine hours, reported the following data for the period just ended: Actual units produced: 15,000 Actual variable overhead incurred: $49,800 Actual machine hours worked: 15,000 Standard variable overhead cost per machine hour: $3.40 If Priority estimates 1.10 hours to manufacture a completed unit, the company's variable-overhead efficiency variance is: Multiple Choice O $1,200 favorable. O $1,200 unfavorable. O $5,100 favorable O $5,100 unfavorable. O None of the answers is correct