Cool Fan Company sells 10,000 units to wholesalers each year at $60 per unit. The materials cost $10 per fan and unit labor cost is $15. The total promotion and marketing costs are $100,000. The facility expenses are $80,000 per year and other overheads cost $20.000, What is the unit variable cost of a fan? O $25 O $ 45 O $15 O $ 35 o $10