Sales = 19,630
Costs = 9,400
Gross Profit = 10,230
Depreciation = 2,070
Interest expense = 1,560
Earnings before tax = 6,600
Taxes at 30% = 1,980
Net Income = 4,620
Add back Depreciation = 2,070 (as it is an non cash expense)
Operating cash flow (OCF) = $ 6,690