Find the doubling time for a city whose population is growing by 23% per year.

To find the doubling time for a population that grows by 23% per year, we use the **Rule of 70**, which is a simplified formula for calculating doubling time.

The formula is:

\[
\text{Doubling Time} = \frac{70}{\text{Growth Rate (\%)}}
\]

Given that the population growth rate is 23%:

\[
\text{Doubling Time} = \frac{70}{23} \approx 3.04 \text{ years}
\]

So, the population of the city will double approximately every **3.04 years**.

Would you like more details on how the Rule of 70 works, or do you have any other questions?

Here are five related questions:
1. How does the Rule of 70 apply to other growth rates?
2. What happens if the growth rate decreases to 10%?
3. How is the doubling time calculated using logarithms?
4. What are other formulas for calculating population growth over time?
5. How does this method apply to financial growth (e.g., compound interest)?

**Tip:** The Rule of 70 is a quick estimation tool, but for more precise results, logarithmic calculations are preferable.

Discover how to calculate the doubling time for a city with a 23% annual population growth using the Rule of 70. This step-by-step guide explains the formula Doubling Time = 70 / Growth Rate (%) and is suitable for students in Grades 9-12.

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