Versions of s. 52(4)
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Where the sale price of goods consists in whole or in part of a royalty, or any other consideration, that is unascertained at the earlier of the time the goods are delivered or the property in the goods passes to the purchaser thereof, the sale price of the goods shall be deemed to be equal to the sale price that would have been reasonable in the circumstances if the whole of the consideration had been ascertained at that time.