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

### Instruction:
 Mifuko ya mchele, ambayo ni kilogramu 50, inagharimu $50. Ikiwa David anauza kwa $1.20 kwa kilogramu, faida yake itakuwa kiasi gani?


### Response:
 Mapato ya David kwa kilogramu 50 za mchele ni $1.20 x 50 = $<<1.20*50=60>>60.
Hivyo, faida yake ni $60 - $50 = $10.