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

Standard hours per unit of output	9.0	hours
Standard variable overhead rate	$15.40	per hour

The following data pertain to operations for the last month:

Actual hours	2,975	hours
Actual total variable manufacturing overhead cost	$46,595
Actual output	250	units

What is the variable overhead efficiency variance for the month?

$11,945 U

$11,165 U

$780 F

$34,650 F