What is average cost of food for one person?

Depends on how much you eat. If you wish to subsist soley on ramen noodles (10c a package,less in bulk) and other cheap food, you can get away with spending only about $50 a month. However, if you have more expensive tastes, or wish to eat something less then pure sodium, it goes up. The average for a person under 25, eating out occasionaly included, seems to be about 200-250 dollars, depending on location.