Last year, Lambeth Pizza Corporation reported sales of $102,000 and costs of $43,500. The following information was also reported for the same period: Beginning Ending Accounts receivable $ 45,120 $ 38,980 Inventory 53,500 59,140 Accounts payable 68,320 75,250 Based on this information, what was Lambeth's change in net working capital for last year? (Negative answer should be indicated by a minus sign. Omit $ sign in your response.) NWC $ What was the net cash flow? (Omit $ sign in your response.) Net cash flow $