I am trying to make a map where if you buy something, the price increases by 15%, so a way to do that would be
/scoreboard players operation @p score1 *= @p score2
where score1 would be something like 15, and score2 would be 1.15% to increase score1. This would allow for almost infinite times, but scoreboards can not do decimals.
Best Answer
Add an objective with some fake players to keep track of numbers:
Then, whenever you want to increase it by 15%, multiply the player's score by 115, then divide it by 100: