Gallatin County Motors Inc. assembles and sells snowmobile engines. The company began operations on July 1 and operated at 100% of capacity during the first month. The following data summarize the results for July: Sales (4,000 units) $2,720,000 Production costs (4,000 units): Direct materials $1,169,600 Direct labor 502,800 Variable factory overhead 82,000 Fixed factory overhead 128,800 1,883,200 Selling and administrative expenses: Variable selling and administrative expenses $58,400 Fixed selling and administrative expenses 24,500 82,900 This information has been collected in the Microsoft Excel Online file. Open the spreadsheet, perform the required analysis, and input your answers in the questions below w $ Gallatin County Motors Inc. Absorption Costing Income Statement For the Month Ended July 31 Sales Cost of goods sold Gross profit Selling and administrative expenses Operating income b. Prepare an income statement according to the variable costing concept. Gallatin County Motors Inc. Variable Costing Income Statement For the Month Ended July 31 Sales $ Variable cost of goods sold Manufacturing margin Variable selling and administrative expenses Contribution margin $ Fixed costs: $ Fixed factory overhead costs Fixed selling and administrative expenses Total fixed costs Operating income $ c. What is the reason for the difference in the amount of Operating income reported in (a) and (b)? Under the method, the fixed manufacturing cost included in the cost of goods sold is matches with the revenues. Under all of the fixed manufacturing cost is deducted in the period in which it is incurred, regardless of the amount of inventory change. Thus, when inventory increases, the income statement will have a higher Operating income than will the variable costing income statement