Below is an instruction that describes a task. Write a response that appropriately completes the request in German. Please answer in German.

### Instruction:
 Jack wants to send thank you cards to everyone who got him a gift for his wedding. He sent out 200 invitations. 90% of people RSVPed but only 80% of people who RSVPed actually showed up. Then 10 people who showed up didn't get a gift. How many thank you cards does he need?


### Response:
 Jack hat 200 Einladungen verschickt. 90% von 200 sind 200 * .9 = 180 Personen haben RSVP gemacht.
80% von 180 sind 180 * .8 = 144 Personen sind erschienen.
144 - 10 = 134 Personen haben ein Geschenk bekommen.
Jack muss jedem, der ihm ein Geschenk gemacht hat, eine Dankeskarte schicken, also braucht er 134 Dankeskarten.