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A shortcut that estimates how long money takes to double is the:
ARule of 27
BRule of 12
CRule of 60
DRule of 72
Answer & Solution
Correct answer: D. Rule of 72
1. It works without a calculator.
2. The number is divided by the rate.
3. It is the rule of 72.
_Source: OpenStax Principles of Finance 2e, Chapter 7, Time Value of Money I._
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