Assume the standard variable overhead rate is $4.90 per machine hour, each unit has a standard time allowed of 2.70 machine hours, and the static budget was based on 46,000 units. If actual units produced were 42,000, actual machine hours worked were 110,000, actual variable overhead incurred was $530,000, the variable overhead efficiency variance is: O $9,000 favorable. $9,000 unfavorable. To 0 0 0 0 $16,660 favorable. $16,660 unfavorable. None of the answers is correct