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

### Instruction:
 Mfanyabiashara anatumia 30% ya misumari katika chombo kurekebisha jikoni. Pia anatumia 70% ya misumari iliyobaki katika chombo kurekebisha uzio. Ikiwa kulikuwa na misumari 400 katika chombo, misumari mingapi imebaki?


### Response:
 Mfanyabiashara anatumia 30/100*400 = <<30/100*400=120>>120 ya misumari kurekebisha jikoni.
Idadi ya misumari iliyobaki katika chombo baada ya kurekebisha jikoni ni 400-120 = <<400-120=280>>280.
Pia anatumia 70/100*280 = <<70/100*280=196>>196 ya misumari iliyobaki katika chombo kurekebisha uzio.
Idadi ya misumari ambayo mfanyabiashara hajatumia ni 280-196 = <<280-196=84>>84.