Ex. 4. In a certain year, the population of a city was about 78 lakh. If it increases by 5%, what will
be its population after one year?
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2
Answer:
Let the population in 2006 be x.
Pop. in 2009=x×(1+
100
5
)
3
⇒1,38,915=x×(
20
21
)
3
⇒x=
9261
138915×8000
=120000
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