Use this information to answer the question that follow. The standard costs and actual costs for factory overhead for the manufacture of 2,500 units of actual production are as follows: Standard Costs Fixed overhead (based on 10,000 hours) 3 hours per unit @ $0.78 per hour Variable overhead 3 hours per unit @ $1.93 per hour Actual Costs Total variable cost, $18,100 Total fixed cost, $8,200 The total factory overhead cost variance is Oa. $3,625 unfavorable Ob. 5,575 unfavorable Oc. $7,525 favorable Od. $5,575 favorable