Your percentages are too low. Share of domestic ticket sales for studios averages somewhere between 50-60% over the box office run of the film. Studios actually get a much larger percent in the first few weeks when a movie earns most of its money, and this percentage shifts more in favor of the theater chains the longer a run continues. That's why movies that have a very poor opening tend to vanish from theaters much faster.
International sales vary by market, but that percentage can be as high as 40% in some cases. Your entire case here is built on an inaccurate break down of revenue.