Assembly line workers at Oriole Manufacturing worked a total of 9800 direct labor hours to produce 38000 units. The standard for producing one unit is 15 minutes at a wage rate of $11.00. If the actual wage rate was $10.5 per direct labor hour, Oriole's direct labor efficiency variance is $3300 unavorable. $3150 favorable. $2000 favorable. $4750 unfavorable..