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The Maxwell Corporation has a standard costing system in which variable manufacturing overhead is assigned to production on the basis of standard machine-hours. The following data are available for July: Actual variable manufacturing overhead cost incurred: $23,940 Actual machine-hours worked: 2,200 hours Variable overhead rate variance: $4,320 Unfavorable Total variable overhead spending variance: $5,940 Unfavorable The variable overhead efficiency variance for July is O $10,260 unfavorable O $10,260 Favorable $1,620 unfavorable O $1,620 Favorable