
Answer:
The answer is: 7% annual growth rate
Explanation:
The Rule of 70 is a way to determine how many years it will take an economy to double its GDP (or GDP per capita) with a given annual growth rate.
The formula used by the Rule of 70 is:
number of years           =                70           Â
to double an economy          annual percentage growth rate
In this exercise we substitute the known variables and calculate:
       10 years  =  70 /  (annual growth rate)
       annual growth rate = 70 / 10 = 7%