The average birth rate of a country in the years 1980 and 1990 are 8%and10% respectively. Find G.M?

or:The average birth rate of a country in the years 1980 and 1990 are 8%and10% respectively. Find G.M?

or:The average birth rate of a country in the years 1980 and 1990 are 8%and10% respectively. Find G.M?

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