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

### Instruction:
 Bwana na Bi McPherson wanatakiwa kufanya upya kodi yao ifikapo mwisho wa mwaka. Walikubaliana kuwa Bi McPherson atachangia 30% ya pesa. Ikiwa kodi yao ni $1200 kwa mwaka, Bwana McPherson anahitaji kuchangia kiasi gani ili kukamilisha kodi?


### Response:
 30% ya $1200 = (30/100)*$1200 = $<<(30/100)*1200=360>>360
Bi McPherson atalipa $360, hivyo Bwana McPherson anahitaji kuchangia $1200-$360 = $<<1200-360=840>>840