The Cullumber Market, Inc., balance sheet for the fiscal year ending September $25,2016$ included the following: total current assets of $\backslash (\backslash$$ $1590\backslash )$ million, total assets of $\backslash (\backslash$$ $4,270\backslash )$ million, total current liabilities of $\backslash (\backslash$$ $820\backslash )$ million, and total liabilities of $\backslash (\backslash$$ $1,040\backslash )$ million. What was the company's net working capital on September $25,2015?$