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17. laci Corporation is a wholesaler that sells a single product. Management has provided the following cost data for two levels of monthly sales volume. The company sells the product for $133.60 per unit. Sales volume (units) Cost of sales Selling and administrative costs $124,400 $136,000 4,000 5,000 $383,600 $479,500 The best estimate of the total contribution margin when 4,300 units are sold is: A. $112,230 B. $162,110 C. $28,380 D. $45,150