Custum save on Foreignkey in Admin

 I have two models:

class Tickets(models.Model):
   ticketnumber = models.IntegerField()
   total_amount = models.DecimalField()

class TicketItems(models.Model):
   name = models.Charfield(max_length=30)
   ticket = models.ForeignKey(Tickets)
   price = models.DecimalField()
   amount = models.IntergerField()

I have an inline Adminpage were users can add TicketItems. How do I update the total_amount of model Tickets from all TicketItems on save (price * amount)?

Django 1.4

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