The following standards for variable manufacturing overhead have been established for a company that makes only one product:
Standard hours per unit of output ----------- 2.7 hours
Standard variable overhead rate ------------ $13.05
The following data pertain to operations for the last month:
Actual hours ------------------------------------------------ 2,400 hours
Actual total variable manufacturing overhead cost --- $30,360
Actual output ----------------------------------------------- 600 units
What is the variable overhead efficiency variance for the month?
a. $9,219 U
b. $10,179 U
c. $9,867 U
d. $648 U