i think its 200yrs because 12.5%x4 =50% which is equal to the 800 years of its half life. by this you can divide 4 by 800 which equals 200 so thats 12.5% OF 800

I THINK

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i think its 200yrs because 12.5%x4 =50% which is equal to the 800 years of its half life. by this you can divide 4 by 800 which equals 200 so thats 12.5% OF 800

I THINK

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