Question

find the population of a city after 2 years which is at present 12lakh if the rate of increase is 4%

Answer 1

after one year population = 1200000*4% +1200000
                                            =1248000
after second year              =1248000*4% + 1248000
                                              =1297920//

Answer 2

Present population=1200000 population at the end of 1st year=present pop.+increase in 1st year =1200000+4/100×1200000 =1200000+48000 =1248000 Population at the end of 2nd year =population at the end of 1st yr.+increase in 2nd yr. =1248000+4/100×1248000 =1248000+49920 =1297920