The annual rate of growth in population of a certain city is 8%.I its present population is 196830,what was the population 3 years ago.
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The annual rate of growth in population of a certain city is 8%.I its present population is 196830,what was the population 3 years ago.
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Let 3 years ago the population of city be ' x '1st year :
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increase in population = 8% of x
= 0.08x
population of city till 2nd year :
= x + 0.08x = 1.08x
2nd year:
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increase in population 8% of 1.08x
= 0.08 × 1.08x = 0.0864x
present population:
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population of city till 3rd year :
population = 1.08x + 0.0864x
= 1.1664x
population of city till 3rd year = present population
but according to given statement, present population of the city = 196830
1.1664x = 196830
x = 168750
Answer:
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population of city 3 years ago was
168750
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