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A manufacturing company leases for $100.000 per year building that houses manufacturing facilities. In addition, the machinery in the building is being paid for installments of $20,000 per year. Each unit of the product produced costs $15 and $10 in materials, can be sold for $40. If the selling price is reduced to $35 per unit, how many must be sold in order to earn a profit of $60,000? A 10,000 B 9,000 C 5,143 D 12,000