The population of a town is 120000. It increases by 15% in the first year and decreases by 10% in the second year. What is the population after two years? MCQ with Answer and Explanation

Question

The population of a town is 120000. It increases by 15% in the first year and decreases by 10% in the second year. What is the population after two years?

A. 125000

B. 124200

C. 126500

D. 123000

Answer: Option B

Solution (By JKSSB Mock Tests)

120000 × 1.15 × 0.9 = 124200.

This question belongs to: Maths Percentage

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Question #1

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A number increased by 30% then decreased by 30% gives 273. Original number:

A. 290

B. 300

C. 280

D. 310

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Correct Answer: Option B

Explanation:
x × 1.3 × 0.7 = 0.91x = 273 → x = 300.

This question belongs to: Maths Percentage

Question #2

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What percent is 250 g of 2 kg?

A. 10%

B. 12.5%

C. 15%

D. 20%

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Correct Answer: Option B

Explanation:
2 kg = 2000 g, (250/2000)×100 = 12.5%.

This question belongs to: Maths Percentage

Question #3

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The price of an article increases by 10%, and then again by 10%. What is the net percentage increase?

A. 22%

B. 25%

C. 21%

D. 20%

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Correct Answer: Option C

Explanation:
Successive percentage formula: a + b + (ab / 100). 10 + 10 + (10 * 10 / 100) = 20 + 1 = 21%.

This question belongs to: Maths Percentage

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