French phrase
En quelle monnaie doit-on ~ ?
Meaning
Which currency should one ___ in?
When to use it
This asks which currency to use for payment. It is a polite, neutral phrase used in shops or at service counters.
Example dialogue
En quelle monnaie doit-on payer ?
Which currency should I pay in?
On peut payer en euros.
You can pay in euros.