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: $35,220

Actual machine-hours worked: 1,200 hours

Variable overhead rate variance: $4,020 Unfavorable

Total variable overhead spending variance: $8,050 Unfavorable

The standard number of machine-hours allowed for July production is