What is the due payment if an animal hired for carrying cotton carries iron by weight, or hired for iron carries cotton?

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The correct ruling is that the customary wage (Ujr al-Mithl) is due in this scenario. This is because the potential harm (damage) of the actual cargo differs from the intended cargo. Therefore, the requirement that the carried item comprises what was stipulated in the rental contract plus an increase is not met, unlike the previous scenarios discussed.