A manufacturing company that has a single product has established the following standards for its variable manufacturing overhead costs. Variable overhead cost standards are based on machine-hours. Standard hours per unit of production 3.90 machine-hours Standard variable overhead rate $11.25 per machine-hour The following data is for last month's operations: Actual hours 8,800 machine-hours Actual total manufacturing variable overhead $95,850 Actual production 2,200 units 

What is the variable overhead efficiency variance for the month?