dont want to wait and find out......

ok so i was growing with 100 watt tomato growing lights but it cost way to much. so now ive switched to 3 27 watt cfl's. anyone live in bc or canada or anywhere i geuse and have any idea what it will cost a month to run all 3 lights? like 15$ 50$ 100$? i'd rather not wait to find out so.

Who's your electricity provider?
I found my rates on the internet then did the maths

Holy shit that copy didn't work, but three 25 watt bulbs running 450 hours(15/9 light cycle for 30 days) $3.42

if you are using cfl's I can't imagin it would cost you more than a few $

what would it cost me to have 3 27 watt lights on 16 hours a day for a month if my electricity rates are 8.27 cents a kwh?