Double your money-Rule of 72. Approximately how long will it take to double your money if you get an annual return of $$ 4.6 \%, 6.5 \% $$, or $$ 10.4 \% $$ on your investment? Approximately how long will it take to double your money if you get a $$ 4.6 \% $$ annual return on your investment? years (Round to two decimal places.)

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To estimate how long it will take to double your money using the **Rule of 72**, you can use the following formula:

$$
\text{Years to Double} = \frac{72}{\text{Annual Return (\%)}}
$$

### For a **4.6%** Annual Return:

$$
\text{Years to Double} = \frac{72}{4.6} \approx 15.65 \text{ years}
$$

**Therefore, it will take approximately 15.65 years to double your money with a 4.6% annual return.**

### Additional Calculations for Other Rates:

- **6.5% Annual Return:**
  $$
  \frac{72}{6.5} \approx 11.08 \text{ years}
  $$
  
- **10.4% Annual Return:**
  $$
  \frac{72}{10.4} \approx 6.92 \text{ years}
  $$

These estimates provide a quick way to gauge the growth of your investment over time using the Rule of 72.
It will take approximately 15.65 years to double your money with a 4.6% annual return.

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