the population of a city was 120000 in the year 2009 during next year it increased by 6% but due to an epidemic it decreased by 5 % in the following year.what is its population in the year 2011.?
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population=120000
it increased by 6%. meaning 6% of 120000+120000
6×120000/100=7200
so 7200+ 120000=127200
again it was decreased by 5% . meaning 127200-5% of 120000
127200-5×120000/100
127200-6000
121200
so the population in 2011 is 121200
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