In 2012, Rector Industries generated net income of $87,800. The company reported depreciation expense of $6,500 and paid dividends of $2,500. During the year, accounts payables increased by $1,300, accounts receivables increased by $2,200, inventory increased by $1,400, and net fixed assets increased by $8,000. Rector has no debt and thus incurred no interest expense. What was the net cash flow from operating activity?