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King Company produces a single product. During March, the company had net operating income under absorption costing that was $3, 500 lower than under variable costing. The company sold 7,000 units in March, and its variable costs were $7 per unit, of which $3 was variable selling expense. If fixed manufacturing overhead was $2 per unit under absorption costing, then how many units did the company produce during March? 5, 250 units 8, 750 units 6, 500 units 6, 125 units