How I can calculate the Net operating working capital?

A B C D Balance sheet Assets Amount ($) Liabilities & stockholder's equity Amount ($) Current assets: Current liabilities: Cash 95000 Accounts payable 89000 Accounts receivable 237000 Notes payable 169000 Inventory 243000 Accruals 87000 Total current assets 575000 Total current liabilities 345000 Net fixed assets: Long term debt 188000 Gross fxed assets 500000 Total liabilities 533000 Less: Accumulated depreciation 75000 Stockholder's equity: Net fixed assets 425000 Common stock 255000 Total assets 1000000 Retained earnings 212000 Total stockholder's equity 467000 Total liabilities & stockholder's equity 1000000