Answer:
$40,000
Explanation:
As we know that net working capital is
Net working capital = Current assets - current liabilities
where,
Current assets = Increase in inventory + increase in account receivable
= $30,000 + $41,000
= $71,000
And, the current liabilities
= Increase in account payable
= $31,000
So, the effect on the firm net working capital is
= $71,000 - $31,000
= $40,000