"Alternator Malfunction" code

Today I was driving, and everything was fine. Suddenly, the power steering stopped working, meaning I couldn't turn the steering to turn. I looked on the screen it said "alternator malfunction". A week a go I seen battery low charge on the screen too.

Two questions: since the power steering stopped, could it be that my belt for the pulley tensioner popped? I heard weird noises while driving after I seen the "alternator malfunction" error code. Maybe the belt was getting chopped up somewhere under...

Next question, how much is parts and labor for a new alternator in the event that I need one?

Thanks !