Does an agreement between two individuals to invest an amount of EGP 300,0 in the stock market, on condition that the profits be EGP 60,0 monthly and that the operator bears any losses, with checks guaranteeing the principal, constitute usury (riba)?

An agreement for a person to work for a fixed amount with a specific profit each month, while guaranteeing the capital, is considered a corrupt Mudarabah (partnership). A corrupt Mudarabah is reverted to a standard Mudarabah (Qirad al-Mithl). If the capital incurs a loss, the capital owner loses from the capital, and the worker loses their effort. The capital owner does not have the right to use checks to recover their full funds, unless it is proven that the worker exceeded their authority or was negligent with the capital. In such a case, the worker guarantees the capital, and the capital owner has the right to recover their full capital without profit, and whatever the worker previously took is considered part of the capital.