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

### Instruction:
 Kim ananunua chakula cha $10 na kinywaji kwa $2.5. Anatoa asilimia 20 ya chakula kama bahasha. Analipa kwa noti ya $20. Atapata kiasi gani kama mabadiliko?


### Response:
 Bahasha inakuja kwa 10*.2=$2.
Hivyo jumla ya gharama ni 10+2.5+2=<<10+2.5+2=14.5>>14.5.
Hii inamaanisha atapata 20-14.5=$<<20-14.5=5.5>>5.5 kama mabadiliko.