Calculate the variable overhead spending variance for the period. Variable overhead spending variance Calculate the variable overhead efficiency (quantity) variance for the period. Variable overhead efficiency variance Calculate the fixed overhead budget (spending) variance for the period. Fixed overhead budget variance Calculate the fixed overhead volume variance for the period. Sheridan Company applies overhead based on direct labour hours. Two direct labour hours are required for each unit of product. Planned production for the period was set at 8,500 units. Manufacturing overhead is budgeted at $136,000 for the period (20\% of this cost is fixed). The 16,200 hours worked during the period resulted in the production of 8,000 units. The variable manufacturing overhead cost incurred was $109,500 and the fixed manufacturing overhead cost was $28,000