Du bör läsa SpeedingEurope sidan för att se böterna angivna i dagliga belopp, varav lägsta är 6 EUR / dag. Polisen kommer att arbeta med det beloppet med en turist, se detta Reddit post :
The law says you're supposed to report your real income and the fine is based on that. In practise you'll get the minimum fine since there is no way to check if you're lying or not. Woudn't be suprised if they don't even bother asking anything. A year or two ago some Finnish NHL player said to police that he's not earning anything and recieved minimum fine. The police later figured out who he really was and then charged him for lying. So it is possible to get caught and punished, but this probably doesn't affect your average tourist.