Question

The population of a city increases 15% annually .If the present population is 20,700 , find the population a year ago..​

Answer 1

Answer:

Step-by-step explanation:

Let last year population be x

increase% =

15

then , the present year population =

x

+

15

of

x

=

1.15

x

20700

=

1.15

x

so,

x

x

=

20700

1.15

=

18000

Answer 2

let initial population was = 100%

this year it increase 15% , so it becomes = 115%

value of this is given, and we have to find initial ,

so,

115% ---------------- 20700

100% --------------- 20700*100/115 = 18000 (ans.)

[ usually we use CI concept in population problems but since they asked only for 1 year , we don't have to use that, because for first year SI and CI remains same ]

[ if you understand my solution mark it as brainlist ]