Powell Panther Corporation: Income Statements for Year Ending December 31 (Millions of Dollars) 2018 2017 Sales $ 1,430.0 $ 1,100.0 Operating costs excluding depreciation and amortization 1,144.0 935.0 EBITDA $ 286.0 $ 165.0 Depreciation and amortization 33.0 25.0 Earnings before interest and taxes (EBIT) $ 253.0 $ 140.0 Interest 32.0 24.0 Earnings before taxes (EBT) $ 221.0 $ 116.0 Taxes (40%) 88.4 46.4 Net income $ 132.6 $ 69.6 Common dividends $ 119.0 $ 56.0 Powell Panther Corporation: Balance Sheets as of December 31 (Millions of Dollars) 2018 2017 Assets Cash and equivalents $ 17.0 $ 15.0 Accounts receivable 157.0 143.0 Inventories 242.0 220.0 Total current assets $ 416.0 $ 378.0 Net plant and equipment 329.0 253.0 Total assets $ 745.0 $ 631.0 Liabilities and Equity Accounts payable $ 86.0 $ 66.0 Accruals 97.0 88.0 Notes payable 29.0 22.0 Total current liabilities $ 212.0 $ 176.0 Long-term bonds 286.0 220.0 Total liabilities $ 498.0 $ 396.0 Common stock 213.4 215.0 Retained earnings 33.6 20.0 Common equity $ 247.0 $ 235.0 Total liabilities and equity $ 745.0 $ 631.0 Write out your answers completely. For example, 25 million should be entered as 25,000,000. Round your answers to the nearest dollar, if necessary. Negative values, if any, should be indicated by a minus sign. What was net operating working capital for 2017 and 2018