All the information displayed is my own interpretation of the data, I achieve this information calculating it by myself. This content is not affiliated with Supercell, and Supercell is not responsable of that. For more information you can see the Supercell Fan Content Policy in their site.
Follow this steps to use the app:
-Open the game
-Go to the shop
-tap on a MegaBox and then the info button
-Copy the odds on the Calculator App
-Tap on Calculate and see the results
REMEMBER: A bigbox is equal to 3 smallboxes and a Megabox is equal to 10 smallboxes