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

### Instruction:
 Janet alinunua mikate ya muffin katika bafuni. Kila muffin ni senti 75. Janet alilipa $20 na akapata $11 kama mabadiliko. Janet alinunua muffin ngapi?


### Response:
 Janet alilipa $20 na akapata $11, hivyo muffin zake ziligharimu $20 - $11 = $<<20-11=9>>9.
Kila muffin iligharimu senti 75, hivyo alinunua 9/.75 = 12 muffin.