A girl once forgot to bring her ticket while on her train. The Ticket conductor asked her for fine. She was wearing a full length dress so her asked her for 100 $ / Rupees.

Another girl who was wearing a knee length dress forgot her ticket. Her fine was 75 $.

The Fine for the girl who was wearing a tube dress was 50 $

And the fine for the one wearing Crop top and  mini skirt was 25$.

But he didn't take any money from the fifth girl. Why?