320watts and monthly cost

[ITHURTZ]

I am trying to figure out how much it would cost to run 320watts over a tank.

According to IL 2008 they charge 12.06 per kwh
http://www.eia.doe.gov/cneaf/electricity/epm/table5_6_a.html

I dunno if I am retarded but 9hr day 320watts would use up 2.88kwh correct? I rounded it to 13 cents and got 37 cents a day, or $11.10 cents a month extra. Would this be correct?

 

[jcardona1]

i got $10.77 assuming 31 days in the month. i put together a little Excel chart to automatically calculate the cost. so yeah, id say youre about right