Question

The annual rate of growth of population is 12 % . If it's present population is 186040, what it was 2 years ago ?​

Answer 1

Given,

The annual growth rate of population is $12$%

The present population is $186040$.

We have to find out what was the population 2 years ago ($12+12=24$%)

$=186040\times \frac{24}{100}$

$=44649.6$

$=44650$

This is the increased population.

Now to get the population for 2 years ago we have to subtract this increased population from present population.

$=186040-44650\\=141390$

Therefore, the population two ago was $141390$.

Answer 2

Answer:

$144069.376$

Step-by-step explanation:

Given data,

• The annual rate of growth of population is $12$%

• Its present population is $186040$

• Let the population one year ago be $x$

Then, $x=186040-186040\times\frac{12}{100}$

$\Rightarrow x= 186040-22324.8$

$\Rightarrow x=163715.2$

Now, let the population $2$ years ago be $y$

$y=163715.2-163715.2\times\frac{12}{100}$

$\Rightarrow y=163715.2-19645.824$

$\Rightarrow y=144069.376$

Hence, the answer is $144069.376$.