Question #2 Lamar Inc. has provided the following for three months of income statements: January February March Sales in Units 3,000 3,500 4,000 Sales 900,000 1,050,000 1,200,000 Less: cost of 540,000 630,000 720,000 goods sold Gross margin 360,000 420,000 480,000 Operating expenses: Advertising 25,000 25,000 25,000 Salaries & 175,000 197,500 220,000 Commissions Depreciation 25,000 25,000 25,000 expense Utilities expense 75,000 87,000 99,000 Total operating 300,000 334,500 369,000 expenses Net Income 60,000 85,500 111,000 For each of the mixed costs, separate them out into their variable and fixed components using the high- low method. State the cost equation for each mixed cost.