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

### Instruction:
 一座25层楼的建筑每层有4个公寓。如果每个公寓住两个人，这座建筑住了多少人？


### Response:
 如果每层楼有4个公寓，那么我们有25层楼 * 4个公寓/层 = <<25*4=100>>100个公寓。
如果每个公寓住2个人，100个公寓 * 2个人/公寓 = <<100*2=200>>200个人。