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 July: Actual variable manufacturing overhead cost incurred: $11,310 Actual machine-hours worked: 1,600 hours Variable overhead rate variance: $1,710 U Total variable overhead spending variance: $2,310 U . . . The standard number of machine-hours allowed for July production is closest to: 1,500 hours 1,600 hours 1,300 hours 1.700 hours