Nile Manufacturing Ltd had the following information for four (4) periods. (per unit) Selling price 120 Variable costs: Direct materials 30 Direct labour 20 Production overheads 10 Selling and admin. 10 Fixed costs from standard production capacity of 10,000 units include: Production N200,000 Selling and Administration M300,000 Output and sales in units are given below: Periods 1 2 3 4 Opening stock 3,000 1,000 4,000 3,000 Production 10,000 12,000 9,000 11,000 Sales 12,000 9,000 10,000 12,000 Closing stock 1,000 4,000 3,000 2,000 Required: Prepare the operating statement for Nile Manufacturing Ltd using marginal costing and absorption costing