please help calculate I am stuck and I dont know why.

Calculate free cash flow for 2017 for Monarch Textiles, Inc, based on the financial Information that follows. Assume that all current llabilities are non-interest-bearing liabilities and that no fixed assets were sold or disposed of during 2017 (Round your answer to decimal places.) Monarch Textiles, Inc. (5 thousands) Income statement Selected balance sheet itens Sales Current assets Cost of sales Net fixed assets Operating expenses Current liabilities Depreciation Interest expense Earnings before taxes Tax Net income 2016 380 132 240 2017 520 264 320 2017 1,340 780 140 66 50 304.00 121.60 182.40 Free cash flow