Burton Corporation has provided the following for three months of income statements: Januaryr February March Sales in Units 3,000 3,500 4,000 Sales 300,000 350,000 400,000 Less: cost of 120,000 140,000 150,000 goods sold Gross margin 180,000 210,000 240,000 Operating expenses: Advertising 10,000 10,000 10,000 Salaries 8. 90,000 95,000 100,000 Commissions Depreciation 25,000 25,000 25,000 expense Utilities expense 7,000 19,500 22,000 Total operating 142,000 149,500 157,000 expenses Net Income 38,000 60,500 33,000 Assume the company plans to sell 3,200 units next month, prepare a contribution margin income statement