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The rate of decomposition of radioactive radium is proportional to the amount present at any time. The halfilife of radioactive radium is 1599 years. What

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The rate of decomposition of radioactive radium is proportional to the amount present at any time. The halfilife of radioactive radium is 1599 years. What percent of a present amount will remain after 175 years? (Round your answer to two decimal places.)

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