Aaron Corporation, which has only one product, has provided the following data concerning its most recent month of operations: Selling price Units in beginning inventory $ 90 0 Units produced Units sold Units in ending inventory Variable costs per unit: Direct materials Direct labor Variable manufacturing overhead 3,400 3,000 400 Variable selling and administrative expense Fixed costs: Fixed manufacturing overhead $ 21 $ 38 $ 6 $ 4 $54,400 Fixed selling and administrative expense $ 3,000 The total contribution margin for the month under variable costing is: