The "rule of 70" is a simple rule

a. (70 divided by the growth rate) that approximates the number of years it will take for income to double at various growth rates.
b. (70 multiplied by the growth rate) that approximates the number of years it will take for income to double at various growth rates.
c. (70 divided by the percentage of population over age 70) that can be used to approximate a nation's growth of real GDP.
d. (70 multiplied by the percentage of population over age 70) that can be used to approximate a nation's growth of real GDP.


A

Economics

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