Answer:
$130
Step-by-step explanation:
The change in net working capital during 2009 shall be determined through following mentioned formula:
Change in net working capital=Net working capital in 2009-Net working capital in 2008
Net working capital in 2009=current assets in 2009-current liabilities in 2009
=$1,680-$1,040
=$640
Net working capital in 2008=current assets in 2008- current liabilities in 2008
=$1,390-$880
=$510
Change in net working capital=$640-$510
=$130