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 @ $0.71 per hour
Variable overhead	3 hours per unit @ $2.08 per hour
Actual Costs
Total variable cost, $18,000
Total fixed cost, $7,800

The amount of the total factory overhead cost variance is

a.$4,175 favorable

b.$5,950 favorable

c.$4,175 unfavorable

d.$2,400 unfavorable