Question

3 year before the population of a village was 10000. If at the end of each year,20% of the people migrated to a nearby town, what is its present population?

Answer 1

QUESTION::

3 year before the population of a village was 10000. If at the end of each year,20% of the people migrated to a nearby town, what is its present population?
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ANSWER::

=>At first year,<=
People migrated =$\frac{20}{100}$×10000.

=>$\frac{20}{100}×10000$

=>2000 people migrated to another town.

Means people remaining=10000-2000=8000.

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=>Let's see second year,<=

People migrated=$\frac{20}{100}×8000$

=>$\frac{20}{100}×8000$

=>1600 people migrated to another town .

Means people remaining= 8000-1600=6400 .

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=>Now let's see third year ;<=

People migrated=$\frac{20}{100}×6400$

=>$\frac{20}{100}×6400$

=>1280 people migrated to another town .

Means people remaining=6400-1280=5120 .

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So the present population of town is :-5120
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