Is working for an unknown commission – at a daily wage of 20 Egyptian pounds – considered earning an unknown percentage? Is the money generated from it unlawful? Is it a condition for the commission to be known when earning profit from the internet? What is the ruling on money earned if the profit percentage is unknown?

In reciprocal contracts, including rental agreements, it is a condition that the object of the contract (the rent) be known to both parties to avoid dispute and uncertainty (gharar). If the rent is unknown to an extent that leads to dispute, the contract becomes invalid. In such a case, the customary rent (ajrat al-mithl) for the benefit that has been utilized becomes obligatory, and it is estimated by experts. The prevailing custom is considered in estimating the rent, unless the two parties agree otherwise. If the amount collected is the customary rent, or what is established by custom, or what both parties agreed upon, then there is no problem. Otherwise, reference is made to custom or the estimation of experts.