4. Arlington Corporation's financial statements (dollars and shares are in millions) are provided here. Income Statement for Year Ending December 31, 2016 Income Statement for Year Ending December 31, 2016 a. What was net operating working capital for 2015 and 2016 ? b. What was Arlington's 2016 free cash flow? (Hint: if the Statement of Cash Flow is not provided, you can also find the CAPEX by calculating the change of Net Plant and Equipment and add the depreciation cost.)