How much would it cost to fix my broken iPhone 5 screen?

So a couple of months ago, friend dropped my friend dropped my iPhone 5.It isn't that bad. The side it broke on was the back side. Where its like a mirror (next to the camera) and i was wondering how much itll cost to get it repaired. I have warranty for apple.
heres a picture of the crack (there's a thin line where it's scratched and another one that's cracked)

About 35-75 bucks