Question

The present population of town is 20000. If the annual birth rate is 4% and annual death rate is 2%, then find the population of town after 3 years.​

Answer 1

2100×20,0002100×20,000

On simplifying the expression, we get,

2100×20,000=4002100×20,000=400

Then, population after one year is 20,000+400=20,40020,000+400=20,400

But, we have to calculate the population after 2 years.

Now, we will find the number of people increased in the second year.

Hence, we will find 20% of 20,400

That is, 2100×20,400=4082100×20,400=408

Now the population after 2 years is 20,400+408=20,80820,400+408=20,808

Therefore, the population of the village after two years is 20,808.