In a city in year 1990 have lived 700000 residents while in year 2000 there were 900000 residents
If you take the growth in population made at the same rate , find :
a) how much is the population grow of the city in the time period 1990-2000 ?
b) how much became the population number this year(2009) ?
c) when will the city have 1400000?