My older brother graduated from UC Berkeley(ZulfiQar ali Bhutto, CEO of Google.com were also students of this university, i didnt know this info before but just want to let you know as well) with GPA 4.0 and he earns $14,000/month. So you can imagine his yearly income. He has been saving money in his bank account for quite a long time. He has been working for the last 6 years and he also owns a property of worth $250,000 in the USA.
He can prove this amount by his bank statements and bank letter. He'll also show income tax documents as well.
I am not going to show anything in my bank account. My sponsor will show money in his bank account.