What is it half life, If 80% of a radioactive element

What is it half life

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If 80% of a radioactive element remains after 250 million years, then what percent remains radioactive after 600 million years? What is it's half life?

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What is it half life : If 80% of a radioactive element remains after 250 million years, then what percent remains radioactive after 600 million years? What is it's half life?

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What is it half life : If 80% of a radioactive element remains after 250 million years, then what percent remains radioactive after 600 million years? What is it's half life?

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