Question

The increase in the population of a city is 15% per year .if the population of the city in 2011 was 6.4 lakh then what will be its population in 2013 ? 1) 8.328lakh 2) 8.464 lakh 3) 8.624lakh 4) 8.848lakh 5) noneofthese

Answer 1

Answer:

2) 8.464 lakhs

Step-by-step explanation:

In 2011 the Population is 640000.

Every year the rise in population is 15%

So in 2012 15 % which is equal to 640000 *15 /100 = 96000

640000 + 96000 = 736000

So in 2013 15 % of 736000 is equal to 736000*15 /100 = 110400

Now the population in 2013 is 846400.

Answer 2

The population of city in 2013 will be 8.464 lakh.

Step-by-step explanation:

We are given that the increase in the population of a city is 15% per year.

And the population of the city in 2011 was 6.4 lakh.

As we know that population in 2013 will be more than 6.4 lakh because there has been an increase in population of city of 15% per year.

So, Population in year 2011  =  6.4 lakh

     Population in year 2012  =  6.4(1 + 0.15) lakh

                                               =  $6.4 \times 1.15$ = 7.36 lakh  

Now, Population in year 2013  =  7.36(1 + 0.15) lakh

                                                   =  $7.36 \times 1.15$

                                                   =  8.464 lakh

Hence, the population of city in 2013 will be 8.464 lakh.