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In 2019 , the firm had $510 in Cash, $1,250 in Accounts Receivable, $1,100 in inventory, $3,500 in total fixed assets, $600 in Accounts Payable, $800 in Notes Payable, and $2,500 in total long-term debt. In 2020, the firm had $570 in Cash, $1,390 in Accounts Receivable, $1,120 in inventory, 4,600 in total fixed assets, $700 in Accounts Payable, $840 in Notes Payable, and $3,500 in total long-term debt. What was the change in Net Working Capital from 2019 to 2020 ? $90 $80 $100 $60