The Maxit 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 Julyc - Actual variable manufacturing overhead cost incurred: $24,600 - Actual machine-hours worked: 2,500 hours - Variable overthead rate varlance: $4,770U - Total variable cverhead spending variance: $6,600U The variable overheod efficiency variance for July is: Mutide choico s1430F 1830 U 511.3700 31830F