Walsh Corporation, which has only one product, has provided the following data concerning its most recent month of operations: Selling price $ 90 0 Units in beginning inventory 3,400 Units produced 3,000 Units sold 400 Units in ending inventory Variable costs per unit: 21 Direct materials 38 Direct labor Variable manufacturing overhead Variable selling and administrative expense $ Fixed costs: Fixed manufacturing overhead $ 54,400 Fixed selling and administrative expense $3,000 The total gross margin for the month under the absorption costing approach is: Select one: a. $59,400 b. $63,000 c. $12,000 d. $27,000