Revenue into the general fund of the state of Texas for any biennium is highly dependent on the price of oil. At a price average of $50 per barrel, general revenue will be $95 billion. At $68 and $75 per barrel, the revenue will be $118 billion and $125 billion, respectively. If the chances are estimated at 10%, 35%, and 55% for oil prices of $50, $68, and $75 per barrel for the next biennium, respectively, the expected revenue (in $ billion) is closest to:

(a) $117.38

(b) $118.02

(c) $118.92

(d) $119.50