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How to borrow money from a friend
Take it seriously.
Maybe you don't have to put on a suit or sit opposite someone behind a big desk like at the bank, but taking out a loan from a friend should not be treated as a trivial matter. Lending and borrowing money is a big deal and should be treated as such.
Make a presentation or pitch as to why you need the money. No, you probably don't need to fire up a powerpoint on the projector, but provide your friend with a clear idea of your intentions for the money.