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.
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9.16 as a percent = 916%= 9.16 * 100%= 916%
22/24=.916 .916 X 100=91.6%
100 cm per metres. so 916 cms = 9.16 metres.
91.6% = 0.916 = 916/1000 = 229/250
916 as a fraction = 916/1