Assume the standard variable overhead rate is $5.10 per machine hour, each unit has a standard time allowed of 3.40 machine hours, and the static budget was based on 46,000 units. If actual units produced were 45,000, actual machine hours worked were 140,000, actual variable overhead incurred was $690,000, the variable overhead efficiency variance is: Multiple Choice O $24,000 favorable. O $24,000 unfavorable. O $66,300 favorable. O $66,300 unfavorable. O None of the answers is correct