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) $ 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