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[Music] cheat code add percentage tax to any transaction step 1 import the open zeppelin safe math utility contract then create a public variable called percentage step 2 create a function to update the percentage variable as you like [Music] step 3 now lets apply the percentage to the desired transaction lets overwrite the transfer from function for example anytime a user decides to transfer erc to 20 tokens to another wallet we will charge a tax fee of 10 to the total amount of tokens to be transferred the formula below reads transfer amount times fee divided by 10 000 basis points important this is not the 10 fee you need to call the function set percentage previously created and apply the percentage ten percent will be one thousand lets apply the tax to the function notice highlighted in green a variable called fee it will store the percentage be calculated basically by applying the tax on the amount of tokens to be transferred by the user we will create another variable below
