The following standards for variable manufacturing overhead have been established for a company that makes only one product:
- Standard hours per unit of output 7.8 hours
- Standard variable overhead rate $12.55 per hour
The following data pertain to operations for the last month:
- Actual hours 2,900 hours
- Actual total variable overhead cost $36,975
- Actual output 200 units
What is the variable overhead efficiency variance for the month?