E6-21 Analyzing Gross Profit Percentage on the Basis of a Multistep Income Statement [LO 6-5] The following information applies to the questions displayed below.] The following summarized data were provided by the records of Mystery Incorporated for the year ended December 31: Office Expense Cost of Goods Sold Income Tax Expense Sales Returns and Allowances Salarles and Wages Expense Sales of Merchandise on Cash 234,000 Sales of Merchandise for Credit40,800 $ 18,700 162,000 16,880 6,870 33,000