Does a society contracting with a company to supply computers to its members, then a bank paying the price and collecting it in installments from the buyers with an increase, constitute "two sales in one sale" and is it forbidden?

The described scenario involves a single sale transaction between the company (seller) and the association (buyer), and a loan contract between the association and the bank. The loan contract is a prohibited interest-bearing (riba al-nasia) transaction because the bank pays the value of the goods to the company in exchange for recovering them from the association at a later date, in installments, with an increment. The sale contract is valid and permissible (halal), while the loan contract is void and forbidden (haram). If the bank purchases the goods from the company with the intention of selling them, there is no harm, even if it adds a profit for the delay and installments, as long as the bank is not interest-based (ribawi). If it is interest-based, then the agreement is forbidden due to dealing with and aiding interest-based banks.