It is not clear what type of machines and goods does your friend give on rent. If your participation in the said business is as per the rules of muzaribah then the fixed amount (Rs. 2250) as profit is against the principles of muzaribah. It is not lawful to fix the profit in this way; rather the profit should be fixed as per the percentage.
Allah (Subhana Wa Ta’ala) knows Best
Darul Uloom Deoband