A farm has 100 chickens.  20 percent are Black Copper Marans, and 80 percent of the Black Copper Marans are hens.  How many BCM hens are there?
How many Black Copper Marans are there? ** Black Copper Marans: 100(.20)=20
How many BCM hens are there? ** BCM Hens:20(.80)=16
#### 16