Net Profit =10,000. Add back non-cash and non-operating: Depreciation 2,000 + General Reserve 3,000 + Goodwill 700 − Profit on sale 300 =15,400 operating profit before working capital changes. Adjust working capital: −300 (debtors) +600 (creditors) −20 (prepaid) −200 (outstanding) =15,480.