'Shekels of Silver' in the Bible

and they shall fine him a hundred shekels of silver and give it to the girl’s father, because he publicly defamed a virgin of Israel. And she shall remain his wife; he cannot divorce her all his days.

then the man who lay with her shall give to the girl’s father fifty shekels of silver, and she shall become his wife because he has violated her; he cannot divorce her all his days.