Please solve this problem:

Problem 12-4A The income statement of Riverbed Corp is presented here Riverbed Corp Income Statement For the Year Ended November 30, 2017 Sales revenue $7,529,600 Cost of goods sold Beginning inventory Purchases Goods available for sale Ending inventory $1,894,900 4,430,700 6,325,600 1,628,800 4,696,800 Total cost of goods sold Gross profit Operating expenses 2,832,800 Selling expenses Administrative expenses 455,400 697,100 1,152,500 Net income $1,680,300