According to the rule of 72, the number of years required for a country's per capita real income to double is approximately equal to 72 divided by the average annual rate of economic growth.

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This is the statement of the rule of 72, which is a mathematical approximation that can be used to estimate the time it takes for an investment or economy to double in size based on a fixed rate of growth.

According to the Rule of 72, the Number of Years