Older style fruit machines would work purely on the basis of probability in terms of how much money they would pay out. Modern machines are usually set to pay out a certain percentage of any money that is put into them (usually between 75% and 80%).

The percent's located on the top right when spinning a fruit are incorrect, so they appear here as their ACTUAL chance (Unfinished).

Common Fruits (63.6%) ...
Uncommon Fruits (25.8%) ...
Rare Fruits (5.2%) ...
Epic Fruits (3.94%) ...
Legendary Fruits (0.76%) ...
Mythical Fruits (0.16%)