The following information for the past year is available from Thinnews Co., a company that uses machine hours to apply standard factory overhead cost to outputs: Actual total factory overhead cost incurred Actual fixed overhead cost incurred Budgeted fixed overhead cost Actual machine hours Standard machine hours allowed for the units manufactured Denominator volume-machine hours Standard variable overhead rate per machine hour $36,000 $18,000 $10,000 8,000 5,500 8,500 $ 3 The variable factory overhead efficiency variance, to the nearest dollar, is: Multiple Choice O $7,500 unfavorable. O $7,900 favorable. O $8,300 unfavorable. O $8,400 favorable