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

### Instruction:
 John ananunua mikate ya pipi 20. Ndugu yake Dave anagharamia 6 kati yao. Ikiwa kila kate ya pipi inagharimu $1.50, John alilipa kiasi gani?


### Response:
 Alilipia mikate ya pipi 20-6=<<20-6=14>>14
Hivyo alilipa 14*1.5=$<<14*1.5=21>>21