Bro ! You really really really need to improve your basic math skill
and your Basic General Knowledge
, my suggestion would be , go back to the school for a few more years , and never ever start any business , where you need to calculate electric power usage
Good Luck 
some countries do not charge by kwatt used per month
some countries charge by amp average by month
so a change from 110 to 220 would lower your bill since amp average drops.
I think India uses this.. but i could be wrong