Doll Furniture gives you the following information for the year ending December 2020. Production 20,000 units Sales 18,000 units There is no opening stock of goods Direct material per unit OMR 2 Variable factory overheads OMR 80,000 Fixed factory overheads OMR 40,000 Variable selling overheads per unit OMR 0.400 Fixed selling overheads OMR 9,000 Selling price per unit OMR 12 The total contribution margin under marginal costing method will be