Sabbat Limited manufactures beds for students in a private hostel. The following information relates to the activities of the company from January to June 2020. Selling price per unit 2,000 Variable cost per unit 800 Fixed monthly manufacturing cost 300,000 Monthly Non manufacturing cost 100,000 There were no opening stocks in January Normal production level in Sabbat Limited is expected to be 1 500 beds per month and production and sales for the period to June 2020 is presented below: January February March April May June Unit solds 1500 1200 1800 1500 1400 1600 Unit produced 1500 1500 1500 1500 1700 1400 Required: Prepare an income statement for Sabbat Limited for each month based on the marginal Costing System [45 marks]