How much will it be to replace my Iphone 4s Screen

My friend, lets call her LaQeefa, Dropped my Iphone4s On the dirty ground! Anyways the top of the screen cracked but, the camera's still work so thats good news. I'm wondering how much it will cost ot fix, it has insurance so would anyone have a estimate or a site that could tell us how much on average it will cost to fix.

You can fix it by yourself, try to watch some videos in youtube how.