The rule of 70 estimates how long it will take a country to double its real GDP per capita by:

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The rule of 70 estimates how long it will take a country to double its real GDP per capita by dividing 70 by the average growth rate. This gives an approximation of the number of years it will take for real GDP per capita to double at a given rate of growth. For example, if a country's real GDP per capita is growing at an average rate of 3.5% per year, it will take approximately 20 years (70 divided by 3.5) for real GDP per capita to double.

The Rule of 70 Estimates How Long It Will Take