Elliot Corporation, which has only one product, has provided the following data concerning its most recent month of operations: Selling price $112 Units in beginning inventory 0 Units produced 4,900 Units sold 4,500 Units in ending inventory 400 Variable costs per unit: Direct materials $19 Direct labor $45 Variable manufacturing overhead $6 Variable selling and administrative $9 Fixed costs: Fixed manufacturing overhead $117,600 Fixed selling and administrative $22,500 What is the net operating income for the month under variable costing? $18,000 ($19,600) $9,600 $8,400