Show the calculations for the below:-

a)How are the changes in working capital computed?

b)How do we get the net change in cash value?

c) What is the free cash flow?

Operating Activities All values USD millions 31-Dec-2018 31-Mar-2019 30-Jun-2019 30-Sep-2019 31-Dec-20195-qtr trend # Net Income before Extraordinaries 861M 3.65B 104M (9.38B) Depreciation, Depletion & Amortization 1.88B 1.71B 1.69B 791M Depreciation and Depletion 1.34B 1.25B 1.23B 487M Amortization of Intangible Assets 536M 463M 453M 304M (1.22B) Deferred Taxes & Investment Tax Credit Deferred Taxes (1.11B) (134M) (1.048) (256M) Investment Tax Credit Other Funds (4.77B) (2.45B) (416M) 9.41B Funds from Operations (3.14B) 2.77B 336M 566M Extraordinaries Changes in Working Capital 7.82B (2.73B) (358M) 1.44B Receivables (3.3B) 315M (1.25B) (924M) Accounts Payable 1.15B 173M 729M 357M Other Assets/Liabilities 8.86B (1.83B) 1.04B 1.87B + Net Operating Cash Flow 4.68B 41M (22M) 2.01B Investing Activities 31-Dec-2018 31-Mar-2019 30-Jun-201930-Sep-2019 31-Dec-2019 5-qtr trend # Capital Expenditures (2.3G) (1.76B) (1.92B) (702M) Capital Expenditures (Fixed Assets) (2.71B) (1.68B) (1.83B) (661M) Capital Expenditures (Other Assets) (83M) (77M) (90M) (41M) Net Assets from Acquisitions (69M) Sale of Fixed Assets & Businesses 5.13B 4.56B 1.36B 3.87B Purchase/Sale of Investments Purchase of Investments Sale/Maturity of Investments Other Uses 224M (968M) (1.070) Other Sources 7.91B 638M 1.42B (372M) + Net Investing Cash Flow 10.4B 3.44B (113M) 1.72B Financing Activities 31-Dec-2018 31-Mar-2019 30-Sep-2019 31-Dec-20195-qtr trend Cash Dividends Paid - Total (1.198) (58) 30-Jun-2019 (238) (236) (87M) Common Dividends (1.198) (881) (37M) Preferred Dividends Change in Capital Stock (11M) 40M (5M) Repurchase of Common & Preferred Stk. (111 Sale of Common & Preferred Stock 40M (5M) Proceeds from Stock Options 40M (5M) (4M) (311 Other Proceeds from Sale of Stock Issuance Reduction of Debt, Net (4.298) (3.27B) (1.98) (7.04) 12.21B Change in Current Debt (2.438) (448M) 12M 249M 185M Change in Long-Term Debt (1.838) (2.838) (1.918) (7.298) 12.038 Issuance of Long-Term Debt 770M 731M 731M (13M) (1.458) Reduction in Long-Term Debt (2.648) (7.288) 13.488 (2.68) (1.21B) Other Funds (3.588) (280M) (286M) (591M) (619M) Other Uses (1.218) (591M) (6191) Other Sources + Net Financing Cash Flow (6.71B) (3.61B) (2.73B) (7.75B) 12.21B Exchange Rate Effect (188M) 78M (77M) (132M) Miscellaneous Funds (2M) IM 3M Net Change in Cash 8.198 (2.948) (4.15B)