The following standards for variable manufacturing overhead have been established for a company that makes only one product: Standard hours per unit of output Standard variable overhead rate 7.6 hours $14.00 per hour The following data pertain to operations for the last month: Actual hours Actual total variable manufacturing overhead cost Actual output 2,800 hours $39,910 150 units What is the variable overhead efficiency variance for the month? Multiple Choice $23,950 U $23,240 V $710 F $15.960 F