Calculate the following values with the aid of the rule of 72.

a. If the annual growth rate of real GDP is 0.6% then it will take_________years for a country's real GDP to double.

b. If the general price level doubles each 36 years the average annual rate of inflation is_________%.Enter your response rounded to 1 decimal place.

c. If the annual population growth rate is 5% then a country's population will double approximately____________-(how many) times in 100 years.