The 2014 balance sheet of Steelo, Inc., showed current assets of $4,530 and current liabilities of $2,830. The 2015 balance sheet showed current assets of $3,200 and current liabilities of $1,650. What was the companys 2015 change in net working capital, or NWC? (Do not round intermediate calculations. Negative amount should be indicated by a minus sign.) Net working capital $