Cost Formula The following amaunts of various cost categories are experienced by Columbia Factories in producing and selling its only product: Direct material Direct labor Manufacturing overhead $12,000+ $4.00 per direct labor hour Selling expenses Administrative *Each unit of product requires one-half direct labor hour. Combine the various cost factors into a general total cost formula for Columbia Factories and determine the total cost of producing and selling 21,000 units. $8.00 per unit of product $10.00 per direct labor hour* s14,000 $3.00 per unit of product $7,000+ s0.50 per unit of product Fixed costs Variable costs Total cost Direct material Direct labor Manufacturing overhead Selling expenses Administrative Total cost Check