The free cash flow can be calculated as below:
Revenue 12000000
Less: Expense (8000000)
Less: Depreciation (1500000)
Earnings Before Tax 2500000
Less Tax (750000)
Earnings after tax 1750000
Add Depreciation 1500000
Total Cash Earnings 3250000
Less: Change in Working Capital (500000)
Less : Purchase of Asset (700000)
Free Cash Flow 2050000
Thus Free Cash Flow can be calculated as above.