The half-life of cobalt-60 is 5.3 years.What percent of a sample of cobalt-60 will remain after 21.2 years?

Name: The half-life of cobalt-60 is 5.3 years.What percent of a sample of cobalt-60 will remain after 21.2 years?
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The half-life of cobalt-60 is 5.3 years. After 5.3 years, half of the sample will remain. After another 5.3 years, half of the remaining sample will remain, and so on. After 21.2 years, which is 4 half-lives, only 1/16 of the original sample will remain, which is 6.25%.

The Half-Life of Cobalt-60 Is 5