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. 

QUESTION: My friend is having a business.he told me to invest some amount of money to him and for that money i invest he will gave me a fixed profit every month .is this come in riba ….. The business he is doing is 100%halal

Halal/Haram Matters, Islamic economy, Riba | January 1, 2023 2:24 am
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QUESTION: Sheik I have invested in my brother-in-law’s restaurant business, the total capital is 8lakhs and we shared 4lakhs each, he alone runs the business and i am sharing profit and loss with him on daily basis on my share of 15%, if the business shuts down and if there is a loss i will lose 50% of my capital. If inbetween I come out or if he sends me out of the business i will get my capital. Halal?
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QUESTION: Sheikh…can a female teacher teach the male students of 8th 9th and 10th. The teacher is 26 years old and abides by the hijab as well as niqab.