How much does it cost to run these things in my fish tanks a month?

All i am wondering is the electric cost (if it is at all possible to tell) for the following things to run per month:
-A 3 gallon filter (it's in my betta's tank) which is ran by an air pump
-Small automatic heater
-Heater (that is in my 10 gal fish tank, so it is a 10 gal size)
-10 gal. filter
-Bubbler/air pump
I feel kinda bad about all the junk i have for my fish tanks because i am living with my parents so they pay for it all.
Just an estimate, how much about does this cost per month? (Not including the filter cartridges, i buy those)
Thanks!
 
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