What is the ruling on taking a loan from an Islamic bank to purchase foodstuffs, with a 10% down payment and 10% installment interest over one year?

If the bank's transaction adheres to Islamic rulings, then there is no objection to it. A bank selling goods to a purchaser for a higher price is called a Murabaha sale, and its most important conditions are: specifying the price, clarifying the number of installments if the payment is deferred, not increasing the price due to delayed payment, and the goods entering the bank's ownership and liability before being sold. The bank's condition of a down payment does not affect the validity of the contract. If the buyer takes possession of the goods, they may sell them to whomever they wish, but they should not sell them back to the same bank that facilitated the transaction, although they may appoint the bank as an agent to sell them. If the buyer's intention is to obtain cash, there is no objection to this; it is called Tawarruq, and it is permissible according to the preponderant opinion.