 You can acquire a long contract for $60.50.To buy 20 long CFDs on 3% margin, you would need $3,630 in your account ($60.50 [long price] x 20 [number of contracts] x 100 [number of barrels in a standard contract] x 0.03 [margin percent]).You would then “control” $121,000 worth of oil for your $3,630.