Adam and Arin Adams have collected their personal asset and liability information and have asked you to put together a balance sheet as of December 31, 2015. The following information is received from the Adams family. <image 1> What was their net working capital (NWC) for the year? (Hint: NWC is the difference between total liquid assets and total current liabilities.)
['$2,100', '$3,100', '$4,100', '$5,100']