Bubba Ho-Tep Company reported net income of $300 million for the most recent fiscal year. The firm had depreciation expenses of $125 million and capital expenditures of $150 million. Although it had no interest expense, the firm did have an increase in net working capital of $20 million. What is Bubba Ho-Tep's free cash flow?

$255 million

$170 million

$150 million

$5 million