quick help please!

A manufacturing company that has only one product has established the following standards for its variable manufacturing overhead. The company bases its variable manufacturing overhead standards on direct labor-hours. The following data pertain to operations for the last month: Actual direct labor-hours 9,300 direct labor-hours Actual total variable manufacturing overhead cost Actual output What is the variable overhead efficiency variance for the month? Muitiple Choice $4.092U $7.513F $7.668U $7.513U