Question:
I can enter 36 Euros, but I can’t enter 36.25 Euros. How can I solve this?
Well, your description is starting out of → NOWHERE.
Maybe you should first describe your setup and give some details.
-You surely working on a wix-store?
-That means you have installed wix-stores?
-Oh, what kind of EDITOR do you use one more time?
-You did use some code? No i don’t think so, regarding your question.
As you can see, before dropping a question out of nowhere, give first some INTRODUCTION into your project, if you are expectiong to get an answer.
In your case → use some code to modify your PRODUCT-PAGE + CHECKOUT-PAGE.