Using the following balance sheets of Mimi’s Gymnastics Inc., what is the net operating working capital (NOWC) for 2020?

Mimi’s Gymnastics Inc.: Balance Sheets as of December 31
(Millions of Dollars)
                                                                                     2020
Assets
Cash ......................................................................... $ 90
Short-term investments ......................................... 110
Accounts receivable ............................................ 1,200
Inventories .............................................................. 900
Total current assets .......................................... $2,300
Net plant and equipment .................................. 2,200
Total assets ....................................................... $4,500
Liabilities and Equity
Accounts payable ............................................... $ 600
Accruals .................................................................. 200
Notes payable ....................................................... 180
Total current liabilities ...................................... $ 980
Long-term debt ..................................................... 800
Total liabilities .................................................. $1,780
Common stock ................................................... 2,200
Retained earnings ................................................ 520
Total common equity .................................... $ 2,720
Total liabilities and equity .............................. $4,500