Please help:

Use this information to answer the question that follow. The standard costs and actual costs for factory overhead for the manufacture of 3,000 units of actual production are as follows: Standard Costs Fixed overhead (based on 10,000 hours) Variable overhead 3 hours per unit @ $0.72 per hour 3 hours per unit @ $2.08 per hour Actual Costs Total variable cost, $17,800 Total fixed cost, $8,100 The total factory overhead cost variance is a. $-200 favorable b. $-200 unfavorable Oc. $-920 unfavorable Od. $520 favorable