you have gathered this information on a firm $500,000 sales, $10,000 cash dividends, $300,000 cost of goods sold, $20,000 administrative expense, $20,000 depreciation expense, $40,000 interest expense, $10,000 purchase of productive equipment, no changes in working capital, and tax rate of 35%. What is the free cash flow?

The answer is $128,000. How do you get to this number?