Getting a fixed return from an investment

Q: I give $5000 to a person in pakistan for investment. He told me that he will give me monthly $300/month on the top of that money. The condition is that the amount on top of $5000 can be $300 or more or less depending upon the business sales.

The second condition is that the owner told me that I can't give you guarantee for $5000 as incase if theres a loss then he will not be responsible for the loss.

My question is, is the $300/monthly return on the $5000  halal or haram?