The Wisco Company has a process cost system. All materials are placed in process when the process is first begun. At the beginning of September, there were no units of product in process. During September 50,000 units were started; 5,000 of these were still in process at the end of September and were 3/5 finished. The equivalent units of material in September were:

Aaron corporation, which has only one product, has provided the following data concerning its most recent month of operations: selling price $ 102 units in beginning inventory 0 units produced 4,900 units sold 4,260 units in ending inventory 640 variable costs per unit: direct materials $ 20 direct labor $ 41 variable manufacturing overhead $ 5 variable selling and administrative expense $ 4 fixed costs: fixed manufacturing overhead $ 64,200 fixed selling and administrative expense $ 2,900 the total contribution margin for the month under variable costing is: