The 2014 balance sheet of Steelo Inc., showed current assets of $2,900 and current liabilities of $1,330. The 2015 balance sheet showed current assets of $2,870 and current liabilities of $1,515. What was the company's 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 S