The deal was to get 5 new members for the Karuta club.  Chihaya has to figure out a way to keep the room and deal with the band club.
It's not a problem, since 
she set up a payment plan.
No hay problema, ya que 
tiene un plan de pagos.
No hay problema, ya que 
me han dejado pagar a plazos.
Não tem problema, já que ela parcelou.