Answer:
Net Cash inflow from operating activities	$67,000
Explanation:
The computation of the net cash flow from operating activities is shown below:
Net Income ($500,000 - $450,000)	$50,000
Add: Depreciation	$10,000
Add: Decrease in account receivable	$5,000
Less: Increase in inventory	($4,000)
Add: Increase in account payable	$6,000
Net Cash inflow from operating activities	$67,000