If the per capita income of a country is growing at 2 percent per year,approximately how long will it take for that income to double?
A)twenty years
B)twenty-five years
C)thirty-five years
D)seventy years

Question

Quizplus · Accepted Answer

The rule of 70 states that to estimate the number of years it takes for a variable to double, divide 70 by the annual growth rate. So, for a 2 percent growth rate, it would take approximately 35 years for the per capita income of a country to double. Therefore, the correct choice is C.

If the Per Capita Income of a Country Is Growing