ANSWER: This is totally prohibited and its riba, one of the major sins in Islam. You must be part of both profit and loss. You can get a fixed percentage on the capital you invested and not a fixed amount. 

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ANSWER: If you agreed to 15% share of the profit, this is fine but you will lose your share in the capital equal to his share if there are losses as you both entered with 50/50 However, if the business shuts down, we must look into what remained from the capital and you and him […]

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