can you help explain me step by step how to get these answers?

Expert Q&A Done The standard cost and actual costs for factory overhead for the manufacture of 2500 units of actual production are as follows Fixed overhead (based on 10000 hours) 3 hours per unit $0.80 per hour Variable overhead 3 hours per unit $2.00 per hour Total variable cost $18000 Total fixed cost $8000 The amount of the fixed factory overhead volume variance is A-$2000 favorable B-$2000 unfavorable C-$2500 unfavorable D-$O The amount of the variable factory overhead controllable variance is A-$2000 unfavorable B-$3000 favorable C-$0 D-$3000 unfavorable