• Profile photo of John Moffat says

      3,000 and 1,000 are the changes in the inventory.

      According to the question (in the Lecture Notes) the opening inventory of wood is 21,000 kg and the closing inventory is 18,000 kg. Since the inventory fell by 3,000 it means that 3,000 of the usage came from inventory and only the remainder needed to be purchased.

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