average cost of spread, fees or comissions??

Hi. today i have a question. I have been trading in my paper account in tradingview app. I have no idea if my wins are reflected after commissions or fees or spread?!!!. i think that commissions or fees aren't apply in paper account!!! My question is , how much on average are in percentage the total fees, comission and spread??? If I were a swing trader, what would be the total costs of each, for example, 10000 dollar trading (buy and sell)? Thanks.

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