Greetings.

I'm a newbie on ebay as a seller and as far as numbers are concerned I have a very low IQ.
Because I don't want to lose money I'm struggling to set up an excel spreadsheet to figure out the correct final prices and make sure I won't lose money.
I'm from Europe but I'm selling (trying to) to sell on US ebay so the first question would be: should I have 2 columns, one with prices in Eur and the other one with prices in USD?

Thank you.
Moravia