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

### Instruction:
 Keki yenye gramu 400 imegawanywa katika sehemu nane sawa. Nathalie anakula sehemu ya nane ya keki, na Pierre anakula mara mbili ya kile alichokula Nathalie. Pierre alikula kiasi gani, kwa gramu?


### Response:
 Nathalie alikula 1/8 * 400g = <<1/8*400=50>>50g ya keki.
Pierre anakula 2 * 50g = <<2*50=100>>100g ya keki.