How is the world population projected to change in the next few decades?

Projection of world population in next few decades:

Current population of the world estimated is around 7.7 billions. The world population project will increase the population from 7.7 million to 9.6 billions by the end of 2050. The increment in population will contribute the developing countries of the world.

The greater number of population the more is the development of the country as they will find million new hands to withstand. This increase in population will contribute to get a better future. The developing nations will grow more rapidly .

what are the statements.?