Fairly cheap. First time user also. We got $10 cards and have been on and off a few times. But it does depend on how far you go... The kiosk where you buy your card will tell you rates from point a to be. The card cost 2 dollars initially plus whatever you put on it for fares
Varies on where you are coming from
I've never used the Metro so I really couldn't help you with this one I'm sorry
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