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srontium-90 has a half life of 29 years. What percentage of the original parent material remains after 87 years
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srontium-90 has a half life of 29 years. What percentage of the original parent material remains after 87 years

User Adrian Avendano
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12.5%

87/27 is 3, so we have to cut the percentage in half three times.

100/2 is 50, 50/2 is 25, and 25/2 is 12.5.
User Ross Presser
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