Gorilla Surgical Instruments (GSI) has a total debt of $300 million and 4 million shares trading at $50 a share. GSI's conservative CFO holds $80 million in cash and $20 million in 3-month US Treasury bills. The CFO also estimates that Gorilla;s equity and debt beta amount to 0.6 and 0.4, respectively. Based on this information, please estimate Gorilla's unlevered beta?

	a.	0.48
	b.	0.47
	c.	0.50
	d.	0.52