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

### Instruction:
 一个农场有100只鸡。其中20%是黑铜马兰鸡，而80%的黑铜马兰鸡是母鸡。有多少只黑铜马兰母鸡？


### Response:
 农场有100(.20)=20只黑铜马兰鸡
有20(.80)=16只黑铜马兰母鸡