We (Saudi Arabia) get paid $9 per barrel for light, sweet crude.

Petrol (and other fractions) sell at a price of $144 a barrel.

Thus, we're missing out on $135 per barrel.

Now, in part this is intentional neglecting of the hard work that the people who turn oil into petrol do. But, at the same time, it's a classical indictment of the colonial system that pays peanuts for raw materials and then reaps huge profits from finished goods, supported by restrictions on knowledge, capital and technology transfers that the colonial system implies.