Solution :
The Cash flow from the operating activities
Sales revenue                                      $ 2,00,000
Less : Cost of goods sold                             $ 1,20,000
Less : operating expenses paid
(excluding depreciation, 50,000 - 21,000) Â Â Â Â Â Â Â Â Â Â Â Â Â Â $ 29,000
Cash generated from the operating activities             $ 51,000
Increase in current assets liabilities
Increase in accounts receivable                         $ 12,000
Increases in inventory                                 $ 11,000
Increase in accounts payable                           $ 13,000
Cash flow from the operating activity                    $ 41,000