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12-10-2018
Mathematics

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Cobalt 60 has an annual decay rate of about 13% how many grams of a 300 g sample will remain after 20 years round to the nearest two decimal places.(please help quick for a quiz):)

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12-10-2018

It loses 13% of its mass and is reduced to 100% -13% = 87% every year.

(300 g) * (0.87)^20 = 18.51 grams

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