What are the free cash flows of a firm with revenues of $600 million, net profit margin of 55%, operating profit margin of 30%, tax rate of 26%, reinvestment rate of 30%, and dividend payout rate of 5%? O a) $53.3 million O b) $66.6 million O c) $79.9 million O d) $86.6 million O e) $93.2 million