The following standards for variable manufacturing overhead have been established for a company that makes only one product:

Standard hours per unit of output		8.8	hours
Standard variable overhead rate	$	15.20	per hour

The following data pertain to operations for the last month:

Actual hours		2,950	hours
Actual total variable manufacturing overhead cost	$	45,610
Actual output		150	units

What is the variable overhead efficiency variance for the month?