A country's population in 1992 waa 83 million and in 1996 was 88 million what was the population in 2013

The population in 1992 was 83 mill ... population is 1996 was 88 mill ...

so in 4 years (from 1992 to 1996), the population rose by (88 mill - 83 mill) = 5 mill

Thats 5,000,000 / 4 = 1,250,000 per year.

so in 2013 (17 years from 1996), the population would be:

83 mill + 1,250,000 (17) = 83 mill + 2,125,000 = 85,125,000 <==