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

### 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:
 90% ya watu walijibu mwaliko, au 200 * 0.9 = <<200*.9=180>>180 watu.
80% ya 180 ni 180 * 0.8 = <<180*.8=144>>144 watu walihudhuria.
10 watu waliohudhuria hawakupata zawadi.
Hivyo, anahitaji kadi za shukrani 144 - 10 = <<144-10=134>>134.