In country B, the annual growth rate of real GDP per capita is 3.2%. Annual population growth rate is 1%. Annual inflation rate is 2%.
Given that the annual growth rate of real GDP per capita = 3.2%, how long does it take for real GDP per capita to double according to the rule of 70? (Round your answer to the nearest first decimal place.)
Answer: It will take _____________ years for real GDP per capita to double.