Bonjour, I have a Navigo Easy card. This morning I want to travel on the Metro from Ecole Veterinaire to Bir-Hakeim. Later today, I want to travel from Bir-Hakeim to Ecole Veterinaire. How much credit do I need to put on the Navigo card please? What kind of credit?
A single Metro ticket / Ticket t+ will be enough for Ecole Veterinaire to Bir-Hakeim, since it is all on the Paris Metro network (and not RER).
You must stay inside the Metro system though to make the transfer (likely from Metro 8 to Metro 6 at station Daumesnil) for the fare to be just one Metro ticket on your Navigo Easy card.