Product Cost Concept of Product Pricing Willis Products Inc. uses the product cost concept of applying the cost-plus approach to product pricing. The costs of producing and selling 4,000 units of medical tablets are as follows: Variable costs per unit: Fixed costs $109 40 34 27 $210 Direct materials Factory overhead $152,000 Direct labor Selling and admin. exp 52,000 Factory overhead Selling and admin. exp Total Willis Products desires a profit equal to a 20% rate of return on invested assets of $384,000. a. Determine the total manufacturing costs for the production and sale of 4,000 units Total Manufacturing Costs Variable Fixed factory overhead Total