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) 3 hours per unit @ $0.73 per hour Variable overhead 3 hours per unit @ $2.05 per hour Actual Costs Total variable cost, $18,200 Total fixed cost, $8,100 The amount of the fixed factory overhead volume variance is a. $584 favorable b. $0 c. $584 unfavorable d. $730 unfavorable