The standard costs and actual costs for factory overhead for the manufacture of 2,800 units of actual production are as follows: Standard Costs Fixed overhead (based on 10,000 hours) 3 hours per unit @ $0.72 per hour Variable overhead 3 hours per unit @ $2.07 per hour Actual Costs Total variable cost, $18,000 Total fixed cost, $8,200 The amount of the fixed factory overhead volume variance is a. $1,152 unfavorable b. $0 C. $922 unfavorable d. $922 favorable