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Well, that depends on a number of factors, including the cost of the house and the type of mortgage you get.
The more money you can put into your down payment, the lower your mortgage payments will be. Some types of loans require 10-20% of the purchase price. While FHA loans require only 3% down - and sometimes less.
I would speak withe a mortgage lender.. I have a few if you would like to speak with someone. you can contact me for hthier names and numbers.
I hope this helps you.