Question

The population of a town increase at annual rate 8 %. If present population of town is 7,496 the find population of town before 2 years.

Answer 1

Answer:

Step-by-step explanation:

Present population =7496

Here asked the population before two years. So by annual rate we can find increasing population for a year.

In here we have to find decreasing population.

let's take the population before two years= a

So first year increasing population ;

a×8/100

End of the first year, total

population= a+a×8/100

Second year increasing population ;

(a+a×8/100)×8/100

End of the second year, total population =

= ( a+a×8/100) +[(a+a×8/100)×8/100]

This population =7496

7496=a+8a/100+8a/100+64a/100

7496=(100a+8a+8a+64a)/100

7496×100=180a

a=749600/180

a=4164.444

Population before two years=4164.44