Is it permissible to engage in triple financing, in which the state and the bank provide a percentage of the equipment's price, and the beneficiary pays the remainder in installments with an increase, while the ownership of the equipment remains with the bank until all dues are settled?

If the bank gives money to a project to purchase equipment, on condition that the money be returned with an increase, then it is an usurious loan (riba) and is forbidden. However, if the bank purchases a part of the equipment for itself and then sells it in installments with an increase, there is no harm in that. It is permissible for the bank to retain the documents until the customer pays the installments, based on the jurists' permissibility of mortgaging the sold item against its price. The contract must be examined to determine the ruling on the transaction.