If the economy booms, Monster Beverage stock is expected to return 20%. If the economy goes into a recessionary period, then Monster Beverage is expected to only return 5%. The probability of a boom is 40% while the probability of a recession is 60%. What is the standard deviation of the returns on Monsters stock?

		a)10.29%
b)		5.42%
c)		3.8%
d)		11.0%