Is it permissible to work for a non-profit international Arab organization that lends to member states at a fixed interest rate not exceeding 3% to cover administrative costs, given that the organization's revenues come from other investments?

Lending with interest is explicit usury by consensus, whether the interest is little or much, fixed or variable. What is claimed to be administrative fees does not justify it, for if it were so, it would be a fixed amount and not a percentage added to the loan amount. Therefore, it is not permissible to work in organizations based on lending with interest, as it constitutes cooperation in sin.