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 fulana 3 ambazo kila moja inagharimu $20. Pia ananunua suruali za $50. Anatumia kiasi gani?


### Response:
 Anatumia $<<20*3+50=90>>90.