Question

in how many years from now will the current population of the cities given below cross 1million if the rate of population growth in the cities is 5% p. a.? the population of city is 870000 .. find out the time period? ​

Answer 1

Answer:

Final population = initial population (1+

100

rate

)

time

.

Let the initial population =x.

The rate =(4+1)% p.a.

Time =2 yrs

∴ the population after 2 yrs. = x×(1+

100

5

)

2

=

400

441x

.

∴ the rise in population =

400

441x

−x

=

400

41x

=

400

41x

×100 p.c

=10.25%