Radium decomposes at a rate proportional to the amount present. If the half-life is 1,600 years, that is, half of any given amount is decomposed in 1,600 years, find the percentage remaining at the end of 200 years.

Elements Of Electromagnetics
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  1. Radium decomposes at a rate proportional to the amount present. If the half-life is 1,600 years, that is, half of any given amount is decomposed in 1,600 years, find the percentage remaining at the end of 200 years.
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