Suppose Pestco, Inc., a profitable pest management firm, has 625 million shares outstanding with a share price of $80, and $25 billion in debt. If in three years, Pestco has 800 million shares outstanding trading for $100 per share, how much debt will Pestco have if it maintains a constant debt-equity ratio (D/E)?

	a.	$40 billion
	b.	$4 billion
	c.	$160 billion
	d.	$20 billion