Is it permissible to deal with Islamic banks that purchase the necessary equipment for a project at double its original price, and is that considered trade or usury?

Murabaha (cost-plus sale) is permissible on condition that the bank owns the commodity and possesses it before selling it to the buyer, so that the bank is responsible for its destruction before delivery or for its hidden defects. It is not permissible for it to be merely a payment of the price with interest, as this is forbidden usury (riba). It is also stipulated that the bank does not impose a financial penalty on the buyer in case of delayed payment, for while the wealthy defaulter is unlawful, it is not permissible to stipulate compensation.