The Rule of 70,as Applied to Real GDP Growth,can Be

The Rule of 70,as applied to real GDP growth,can be used to find the

A) real GDP growth rate necessary to double growth.
B) number of years it takes for the level of real GDP to double.
C) growth rate of real GDP.
D) number of years it takes for the growth rate of real GDP to double.
E) population growth rate necessary to double the GDP growth rate.