Your teenager is costing you a FORTUNE. But at least they're always so appreciative and easygoing in return . . .

According to a new study, the average teenager costs their parents $9,570 a year. Assuming they're at home from age 13 through 18, that's a total of $57,420.

More than HALF of that goes toward their food. They eat their way through about $4,800 every year, or $400 every month.

Other big costs are cell phone bills, giving them spending money, trips, sports and school activities, and gas.

The study also found having a teenager at home drives up the electric bill by $36 a month.

(Daily Mail)