how to make a convertor stats in housing

[CaveZap]

im creating a simulator in housing and i want to do that u can sell your "energy" for coins and 1 enegry = 100 coins and there is an npc that converts your energy to coins all by 1 click like if u have 11 enegry so by 1 click your energy is gone but u get 1100 coins
sorry for bad english

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