Find the rate at which a sum of money will double itself in 3 years, if the interest is compounded annually.

Explanation

To find the rate at which a sum of money will double itself in 3 years with compound interest, we can use the formula for compound interest:

\[ A = P(1 + r)^n \]

Where:
- \( A \) is the amount of money accumulated after n years, including interest.
- \( P \) is the principal amount (the initial sum of money).
- \( r \) is the rate of interest (in decimal).
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