Hi cnsnz!
First: Good luck for the the interview!
About prices... Dubai varies widely - you can get a lunchbuffet from as little as 10 Dhs upwards. Otherwise: A meal at MacDonalds is around 12-16 Dhs, a scoop of icecream (open from Häagen Dasz) 5 Dhs, a maindish at various restaurants (Chillies, TGFI, ... usually 25-40 Dhs. Alcohol is pretty expensive - so if you plan on going out take that in to account. Good thing is: credit cards are widely accepted - at shops as well as restaurants.
1 US$= 3.67 Dhs
Come here, have fun! Enjoy your time!!
Eli