Summary: case the house is getting 20%. In more expensive games, the house will usually take a smaller percentage. An example would be a $5,000 + $200 tournament, in this case the house is getting 4%. Each participant starts with the same number of chips and the game is played until there is only player left with all the chips. The number of chips you start with depends on the site hosting
Image Dimensions: 128 x 180
Image originally found here.