Superior Furniture has expanded its operations over the last 5 years. Their finance director knows they have spent a lot of money over this time and was curious as to how much they have spent on net working capital. She hands you parts of the balance sheets for the company for 2009 and 2014. You note the following assets and liabilities:

Balance Sheet 2009

• Inventory 329
• Accounts Receivable 247
• PP&E 314
• Accounts Payable 319
• Short Term Debt 169

Balance Sheet 2014

• Inventory 889
• Accounts Receivable 698
• PP&E 569
• Accounts Payable 571
• Short Term Debt 702

How much has Superior Furniture spent on net working capital in total over the 5 years?