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The rate of population growth of a country is proportional to the number of inhabitants . If the population of a certain country is now

  1. The rate of population growth of a country is proportional to the number of inhabitants . If the population of a certain country is now 40million and 50 million in 10 years' time, what will be its population 20 years from now?
  2. A certain radioactive element dissipates at a rate proportional to its amount instantaneously present. If one-half of any given amount of the element dissipates in 1600 yrs. What fraction will dissipate during the second century?

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