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

### Instruction:
 Melony hupata faida ya $21 kila anapouza mashati 3 na mara nne zaidi ya faida anapouza jozi mbili za viatu vya kike. Atapata faida kiasi gani ikiwa atauza mashati 7 na jozi 3 za viatu vya kike?


### Response:
 Anapouza mashati 3, Melony hupata faida ya $21 kwa kila shati anayouza.
Faida kwa kila shati anayouza ni $21/3 = $<<21/3=7>>7.
Anapouza mashati 7, Melony atapata faida ya mashati 7 * $7 = $<<7*7=49>>49.
Faida mara nne ni $21 * 4 = $<<21*4=84>>84.
Anapouza jozi mbili za viatu, Melony atapata faida ya $84 kwa kila jozi ya viatu anayouza.
Faida kwa kila jozi ya viatu anayouza ni $84/2 = $<<84/2=42>>42.
Anapouza jozi 3 za viatu, Melony atapata faida ya $42 * 3 = $<<42*3=126>>126.
Melony atapata jumla ya faida ya $126 + $49 = $<<126+49=175>>175.