Magic find

[Bedstar]

Ok so im trying to make a magic find system which doubles your chances for every 100 magic find you have.
here is the code:

options:
    coal_precentage: 5
    iron_precentage: 2.5
    gold_precentage: 1
    diamond_precentage: 0.5
    emerald_precentage: 0.1
    netherite_precentage: 0.01
    
variables:
    {player.magicfind.%player%} = 1
    
on break of stone:
    set {_multiplier} to {player.magicfind.%player%} * 0.01 + 1
    set {coal.perc.%player%} to {coal.perc.%player%} * {_multiplier}
    
command /magicfind <int>:
    trigger:
        if arg-1 is set:
            add arg-1 to {coal.perc.%player%}
            
command /testfind:
    trigger:
        send "you have %{coal.perc.%player%}% percentage","you have %{player.magicfind.%player%}% magic find" to player

however my event of multiplying the percentage isnt good, because if i break stone it will continue to multiply it,

what event would be good for magic find, and if you can improve my code in anyway ill appreciate it.

last time i tested this i got a lil bit of luck: 3m percentage to drop coal and 1000 magic find