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Harris 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 $84.40 per unit. Sales volume (units) 5,000 6,000 Cost of sales $285,000 $342,000 Selling and administrative costs $107,500 $120,000 The best estimate of the total variable cost per unit is: $77.00 $57.00 $69.50 $78.50