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Yes, it's very possible to do banking without interest. This is the concept of Islamic banking where the main core of transactions is not based on the lending / borrowing model of avoiding the business risk, but on the business partnership (buying / selling / partnering / risk-sharing / delegating) model. It's been proven successful, just and fair.
Yes. You can conveniently do what is known as "Mudorobah" i.e partnership in business.
Yes it is possible if men want to do anything, they can do.