Most gold bricks or bars are 99.99% pure gold
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1 percent alloy. The gold would be soft.
24 carat gold is from 90% to 99.9% gold.
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The answer is in the question. Take 91.6 units of gold and add 8.4 units of impurities. This is equivalent to taking 100 units of gold and adding 100 x 8.4/91.6 = 9.17 units of impurities.