From 2006 to 2010, per capita real gross domestic product GDP) in India grew an average of 7.11 percent per year. At that rate, according to the Rule of 70, in roughly how many years will the Indian economy double in size?

Question

Quizplus · Accepted Answer

The Rule of 70 states that to find the approximate number of years for a variable to double, divide 70 by the annual growth rate. 
In this case, 70 divided by the annual growth rate of 7.11% is approximately 9.8 years. Therefore, the Indian economy will double in size in about 9.8 years.

From 2006 to 2010, Per Capita Real Gross Domestic Product