przerobienie skryptu chance of

Skrypt:

on right click on ender chest:
    block under is bedrock:
        cancel event
        open chest inventory with 1 rows named "&6Skrzynki" to player
        set slot 0 of player's current inventory to chest named "&7&lZwykla"
        set slot 2 of player's current inventory to chest named "&a&lPospolita"
        set slot 4 of player's current inventory to chest named "&b&lRzadka"
        set slot 6 of player's current inventory to chest named "&5&lEpicka"
        set slot 8 of player's current inventory to chest named "&6&lLegendarna"

on inventory click:
    if inventory name of current inventory of player is "&6Skrzynki":
        clicked slot is 0:
            if player have 1 tripwire hook named "&7&lZwykly Klucz":
                cancel event
                remove 1 tripwire hook named "&7&lZwykly Klucz" from player's inventory
                chance of 80%:
                    give 6 obsidian to player
                    broadcast "&6%player% &7wylosowal: &6Obsydian (x6)"
                chance of 70%:
                    give 32 brick block to player
                    broadcast "&6%player% &7wylosowal: &6Cegly (x32)"
                chance of 60%:
                    give 16 apple to player
                    broadcast "&6%player% &7wylosowal: &6Jablko (x16)"
            if player don't have 1 tripwire hook named "&7&lZwykly Klucz":
                cancel event
                wait 0.2 seconds
                send player title "&4&lBLAD" with subtitle "&cNie masz klucza!"
                close player's inventory

Gdy klikam w gui na Zwykla to wtedy losuje mi wiele itemow a ja chce zeby tylko pojedyncze itemy sie losowaly np tylko obsydian, a nie w tym samym monecie jablka i cegly