The following standards for variable manufacturing overhead have been established for a company that makes only one product: Standard hours per unit of output 8.0 hours Standard variable overhead rate $14.40 per hour The following data pertain to operations for the last month: Actual hours 2,850 hours Actual total variable manufacturing overhead cost $41,770 Actual output 200 units What is the variable overhead efficiency variance for the month?

$730 U

$18,730 U

$23,040 F

$18,000 U