My income is $360 (11000 rub) + my wife(unemployment benefit and she works (not official) as a janitor) $130, then $490 per month. I've got 2 kids.
My spending per month:
I've got an own apartment so I pay for utilities only(cold and hot water, heat, elecricity, elevator etc) - $25
food - $200-250
kindergarten - $10
school breakfasts - $7
cellural phones - $25
rides by bus - $30
So my spending is about 290-350 per month.
The prices mostly are as Tu-160 said, but cell phones cost from $60 for new one, 1 minute of call costs from $0,04 up to $0,12.
I've got a car but I see no reasons to use it all the time becouse a bus ticket costs only $0.17 and the average time interval between buses or trolleybuses is about several minutes.