The 2008 balance sheet of Saddle Creek, Inc., showed current assets of $2,100 and current liabilities of $1,380. The 2009 balance sheet showed current assets of $2,250 and current liabilities of $1,710. (Do not include the dollar sign ($). Negative amount should be indicated by a minus sign.) The company's 2009 change in net working capital, or NWC, is $540 incorrect.