What is the ruling on participating in the construction of a school through a share-based system with a real estate investor, provided that the profits are a percentage of the share value, increasing gradually to reach their maximum in the fourth year?

It is permissible for a group to partner with a real estate investor to build a private school under a shareholding system. The profit must be a known percentage of the total profit, such as 50% for the investor and 50% for the shareholders. It is not permissible for the profit per share to be a percentage of the share's value, as this is like stipulating a known sum of money, which is void in partnerships. Scholars have unanimously agreed on the invalidity of Qirad (Mudarabah) if one of the partners stipulates a specific amount of the profit.