PayPal - Currencies Question

I have the following question: The main currency of my Paypal account is USD and right now my balance is $30 USD and I also have there ?47 EUR (because I received a payment is Euros from a EU buyer). I wonder if I make a payment of $40 USD, will it use my EUR balance as well? Or will my EUR balance stay as it is and the remaining amount will be deducted from my credit card?

it will use the 30$ then take the remaining 10 $ from the 47 euro balance ( currency exchange) fee will apply

Thank you for your reply.

it could also take from cc so be careful better to do currency conversion before try

Thanks for your advice. So I've rather converted it all to USD.