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

### Instruction:
Lyanna set up a food bank to collect food to give to the homeless in her local town. In the first week, 40 pounds of food were donated to the food bank by the people of her local town. In the second week, donations were twice as high as the first week. If she gave out 70% of the donated food to the homeless in the third week, calculate the amount of food remaining in the food bank.

### Response:
 Ikiwa paundi 40 za chakula zilichangwa kwenye benki ya chakula katika wiki ya kwanza, katika wiki ya pili, idadi ya chakula kilichochangwa ilikuwa mara mbili ya paundi 40, ambayo ni 2*40 = <<40*2=80>>80 za chakula zilichangwa.
Jumla ya chakula kilichochangwa kwenye benki ya chakula baada ya wiki ya pili ni 80+40 = <<80+40=120>>120 za chakula.
Katika wiki ya tatu, Lyanna alitoa kwa watu wasio na makazi 70/100*120 = <<70/100*120=84>>84 za chakula.
Jumla ya chakula kilichobaki kwenye benki ya chakula baada ya kutoa 70% kwa watu wasio na makazi ni 120-84 = <<120-84=36>>36 za chakula.