What is the ruling on investing in Al-Jum'a Real Estate Company with a capital and a 30% profit not mentioned in the contract, given the difference in the company's activity?

We cannot pass judgment on Al-Juma Real Estate Company because we do not know it. The controlling factor for permissibility in dealing with financial institutions is their freedom from Sharia-prohibited elements, such as usurious loans, gharar (excessive uncertainty), and Jahala (ignorance of essential terms). The company's predetermined profit percentage (30%) indicates an impermissible transaction, similar to the method used by usurious banks. If its dealings are in accordance with Sharia, then there is no harm; otherwise, it must be abandoned, and one should deal with other legitimate institutions.