ok lets make it more simple for you....if you take in $100 a day, and....
the cost is $50 then your profit is $50.....let say costs go up $ 10 and you pass this on to the consumer(which is what the oil companies say they are doing and is the "only reason gas prises are going up) ...then you take in $110....cost is now $60, your profit is still $50...hence the same, not 50%
more than you where already getting....simple math