per month
How much does it cost per month?
Wie viel verdient er pro Monat?
How much does he earn per month?
Was kostet die Miete pro Monat?
How much does the rent cost per month?
Ich schaue durchschnittlich zwei Filme pro Monat.
I watch an average of two movies per month.
Ich gehe einmal pro Monat zum Friseur.
I go to the hairdresser once a month.