If 10% of a radioactive material decays in 10 days the percentage of the material that decays in 20 days is
A) 20% (B) 41% (C) 81% (D) 19% (E) 90%
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10% of a radioactive material decays in 10 days
therefore, percentage of material that decays in 20 days= (20×10)/10=20%
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