Coke first timer

So me (have done coke twice but never paid for it always got it for free) and my friend (hasnt done coke) are planning on getting half a gram of coke for $60 I have a couple questions,

1. I know coke normally goes for $100 a gram around where I live, is $60 right though for half a gram?

2. Is .5 enough for 2 people?

Any help would be great!