If it will take 40 years for a nation's income to double, then its growth rate must be 1.75%.

Name: If it will take 40 years for a nation's income to double, then its growth rate must be 1.75%.
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Quizplus · Accepted Answer

This is based on the Rule of 70, which estimates the number of years required to double an investment at a constant rate of return. The formula is 70 divided by the growth rate. So, 70 divided by 40 years equals a 1.75% growth rate.

If It Will Take 40 Years for a Nation's Income