What's the FCFF of a company with total revenues of $200 million, gross profit margin of 60%, operating profit margin of 35%, net profit margin of 5%, tax rate of 30%, depreciation and amortization of $40 million, capital expenditures of $80 million, acquisition costs of $20 million and a decline in net working capital of $10 million? a. -$8 million b. -$1 million c. $6 million d. $13 million e. $20 million