Crane Manufacturing produces gourmet blackberry preserves. Crane based its current year budget on a production level of 542400 jars of preserves using 4 hour direct labor time for each jar (which includes hand-sorting and trimming the berries). Total budgeted variable overhead for the year was $1246800. During the year, Crane used 282400 direct labor hours to produce 552400 jars of blackberry preserves. Actual variable overhead for the year was $1253200. What is Crane's variable overhead efficiency variance? $6400 unfavorable $6400 favorable $28520 favorable $28520 unfavorable