Given,
Annually increase rate of population of city = 4%
Population in 1999 = 6760000
So ,
i) Population of city in 2001 (2 years after)
\(= 6760000({1}+\frac{4}{100})({1}+\frac{4}{100})\)
\(= 6760000\times\frac{26}{25}\times\frac{26}{25}\) = 7311616.
ii) Population of city in 1997 (2 years ago)
\(= 6760000({1}-\frac{4}{100})({1}-\frac{4}{100})\)
\(= 6760000\times\frac{21}{25}\times\frac{21}{25}\) = 6750000