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Physics: Solve a population doubling question

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An easy way to find the time it takes for compound interest to double an investment is to divide 72 by the interest rate in percent. For example, money invested at 3% interest will double in 72/3 = 24 years. This can also be used to compute population doubling. If the current population growth rate is about 2%, when will the world population be 12B if it is now 6B? When will it be 96B?

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