The balance sheet of Koehn, Incorporated, has the following balances: Beginning balance Ending balance Cash $ 30,300 $ 32,800 Accounts receivable 48,200 51,600 Inventory 126,500 129,200 Net fixed assets 611,900 574,300 Accounts payable 43,200 53,600 Long-term debt 415,000 304,200 What is the amount of the change in net working capital?