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Answer: Divide purity units by the number of units that represents 100% purity, then multiple by 100. The answer will be the percentage purity.
For example: If a piece of gold contains 18 units of gold and 100% pure gold is 24 units, then we can calculate the purity of the gold piece as follows: 18/24 = .75 * 100 = 75% purity.
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