今天题目的主题是reconcile，只不过又是另外一种小变形。
　　Last month a manufacturing company’s profit was $2 000, calculated using absorption costing principles. If marginal costing principles has been used, a loss of $ 3 000 would have occurred. The company’s fixed production cost is $ 2 per units. Sales last month were 10 000 units.
　　What was last month’s production (in units)?

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