Best way to check multiple strings in an if statemet

What is the cleanest way of checking multiple strings in an if statement, I want to be able to check to see if the users country is one that uses the euro which I will put in the ("???") .Because this works.

if (usercountry.equals("FRA")||usercountry.equals("FRA")||usercountry.equals("FRA")||usercountry.equals("FRA")||usercountry.equals("FRA")||usercountry.equals("FRA")||usercountry.equals("FRA")||usercountry.equals("FRA")||usercountry.equals("FRA"))
            {
        costpermile = costpermile*1.42;   //(costpermile=£)   (costpermile*1.42=Euros)
    }

but it looks awful

BTW im not checking France over and over again its still prototype code and so I haven't entered every euro country without checking if there was a better way first. Thanks in advance