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Answer:a) 18.34%Explanation:Real gain = [Real GDP year 2010]/[Real GDP year 2000]= [nominal GDP ]/[nominal GDP]Real GDP gain(2000) = [nominal GDP ]/[nominal GDP]= $672billion/24= 28Real GDP gain(2010) = [nominal GDP ]/[nominal GDP]= $1,690 billion/51= 33.14Real gain = Real GDP gain(2010)/Real GDP gain(2000) - 1= 33.14/28 - 1= 0.1834Therefore, The real gain is 18.34%...