400 Aaron Corporation, which has only one product, has provided the following data concerning its most recent month of operations: Selling price 90 Units in beginning inventory Units produced 3.400 Units sold 3,000 Units in ending inventory Variable costs per unit: Direct materials $ 21 Direct labor $ 38 Variable manufacturing overhead Variable selling and administrative expense Fixed costs: Fixed manufacturing over head $54,400 Fixed selling and administrative expense $3,000 What is the net operating income for the month under variable costing? $ 6 $ 4 $12.000 $120.400) $5,600 $6.400