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anonymous

  • 5 years ago

Use the rule of 70 to find the approximate doubling time for a population whose annual growth rate is 0.7% (U.S.)? and 1.2% (World)?

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  1. anonymous
    • 5 years ago
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    i thought it was the rule of 72! it says doubling time is \[\frac{72}{r}\]

  2. anonymous
    • 5 years ago
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    so first one would be \[\frac{10}{.7}=100\]

  3. anonymous
    • 5 years ago
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    second would be \[\frac{70}{1.2}=58.3\] rounded

  4. anonymous
    • 5 years ago
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    there is rule of 70 I just dont have my book for the formula

  5. anonymous
    • 5 years ago
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    i think 72 is closer, but it is just an approximation in any case

  6. anonymous
    • 5 years ago
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    fine use 70. close enough. it is rule of thumb, not an exact answer.

  7. anonymous
    • 5 years ago
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    thanks

  8. anonymous
    • 5 years ago
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    welcome!

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