A company has a $10 million portfolio : with a beta of 1.5. Suppose that the standard deviation of semi-annual changes in the prices of a commodity is $0.72, the standard deviation of semi- annual changes in a futures price on the a commodity is $0.81, and the coefficient of correlation between the two changes is 0.9. if the company expects to purchase 1 million commodity units in 6 months, and decided to hedge its current position using oil future (standard contract quantity 10,000 barrel/contract). How many contracts of oil futures would be used for hedge? O 10,000 O 120 O 90 80