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

### Instruction:
 Bi Oaklyn hununua zulia za mikono kwa $40 kila moja na kuziuza kwa $60 kila moja. Ikiwa alinunua mazulia 20, hesabu faida atakayopata kutokana na kuuza mazulia hayo.


### Response:
 Kwa kuwa alinunua mazulia 20 kwa $40 na kuyauza kwa $60 kila moja, alipata faida ya 60-40 = $<<60-40=20>>20 kila moja
Ikiwa alipata faida ya $20 kila moja kwa mazulia 20, faida yake jumla ni 20*20 = $400