How much will cost?

How much will I have to pay Epic Games if I create a free game , but with in-game purchases ?
Sorry for my bad english , I’m using Google translator.

i dont know how they relate to ingame purchases but in common they dont get into profit until you harvested 50.000 dollars with ur game , i would say the count it too, so sell price + ingame purchases

Once you ship your game or application, you pay Epic 5% of gross revenue after the first $3,000 per product per calendar quarter. For a more detailed explanation of how that works, see the EULA and our product release page. We also offer custom license terms to companies who prefer to pay an upfront license fee in order to lower the royalty rate.

You can read more here:

https://www.unrealengine.com/faq