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The population of a town is 10,000. It increased by 10% during the first year. During the second year, it decreased by 20% and increased by 30% during the third year. What is the population after 3 years?
- a)11440
- b)12440
- c)13450
- d)14440
Correct answer is option 'A'. Can you explain this answer?
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Calculation:
- Population after first year = 10,000 + (10% of 10,000) = 11,000
- Population after second year = 11,000 - (20% of 11,000) = 8,800
- Population after third year = 8,800 + (30% of 8,800) = 11,440
Therefore, the population after 3 years is 11,440 which is option A.
Explanation:
The problem requires a simple calculation of population changes over 3 years. To solve this problem, we can break it down into three parts as follows:
- Population after first year: We add 10% of the original population to the current population to get the new population after the first year.
- Population after second year: We subtract 20% of the population after the first year from the population after the first year to get the new population after the second year.
- Population after third year: We add 30% of the population after the second year to the population after the second year to get the new population after the third year.
After following these steps, we get the final population of 11,440 which is option A.
- Population after first year = 10,000 + (10% of 10,000) = 11,000
- Population after second year = 11,000 - (20% of 11,000) = 8,800
- Population after third year = 8,800 + (30% of 8,800) = 11,440
Therefore, the population after 3 years is 11,440 which is option A.
Explanation:
The problem requires a simple calculation of population changes over 3 years. To solve this problem, we can break it down into three parts as follows:
- Population after first year: We add 10% of the original population to the current population to get the new population after the first year.
- Population after second year: We subtract 20% of the population after the first year from the population after the first year to get the new population after the second year.
- Population after third year: We add 30% of the population after the second year to the population after the second year to get the new population after the third year.
After following these steps, we get the final population of 11,440 which is option A.
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