The Following Table Shows the GDP Per Capita of Various

The following table shows the GDP per capita of various countries for the years 1960 and 2010 in PPP-adjusted 2005 dollars.The table also contains the implied growth rates,which show how much on average each country needed to grow each year to reach the 2010 level of GDP per capita starting from the 1960 level of GDP per capita.Use the table to answer the following questions.

a)During 1960-2010,which countries were able to reduce the gap between their GDP per capita and the U.S.GDP per capita?
b)During 1960-2010,which countries failed to reduce the gap between their GDP per capita and the U.S.GDP per capita?
c)Why have some countries reduced the gap between their incomes and that of the United States and other countries failed to do so?