Use this information to answer the question that follow. The standard costs and actual costs for factory overhead for the manufacture of 2,700 units of actual production are as follows: Standard Costs Fixed overhead (based on 10,000 hours) 3 hours per unit @ $0.75 per hour Variable overhead 3 hours per unit @ $1.93 per hour Actual Costs Total variable cost, $18,100 Total fixed cost, $7,900 The fixed factory overhead volume variance is O a. $1,425 unfavorable ' O b. $1,140 favorable c. $0 0 (1. $1,140 unfavorable