I cant seem to figure this out

Income Statements under Absorption Costing and Variable Costing 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 (18,000 units) $1,800,000 Production costs (23,000 units): Direct materials $851,000 Direct labor 409,400 Variable factory overhead 204,700 Fixed factory overhead 135,700 1,600,800 Selling and administrative expenses: Variable selling and administrative expenses $248,100 Fixed selling and administrative expenses 96,000 344,100 If required, round interim per-unit calculations to the nearest cent. a. Prepare an income statement according to the absorption costing concept. Gallatin County Motors Inc. Absorption Costing Income Statement For the Month Ended July 31 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 000100 Fixed costs: 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 matched with the revenues. Under , all of the fixed manufacturing cost is deducted in the period which it is incurred, regardless of the amount of inventory change. Thus, when inventory increases, the_ income statement will have a higher operating income