what was net profit margin in 2018

Item Accounts payable Accounts receivable Accruals Cash Common Stock COGS Depreciation expense Interest expense Inventories Long-term debt Net fixed assets Notes payable Operating expenses (excl. depr.) Retained earnings Sales Taxes 2017 1,100 1,020 2,000 ??? 7,000 8,000 400 340 6,000 3,000 8,400 1,500 3,000 1,420 14,000 200 2018 1,210 1,450 1,400 1,420 7,500 9,200 700 380 5,700 2,760 ??? 1,700 3,800 2,000 17,000 260 The net profit margin in 2018 was $ %