A population increases by 20% in the first year and decreases by 20% in the second year. What is the net change over the two years? MCQ with Answer and Explanation

Question

A population increases by 20% in the first year and decreases by 20% in the second year. What is the net change over the two years?

A. 2% decrease

B. 4% increase

C. No change

D. 4% decrease

Answer: Option D

Solution (By JKSSB Mock Tests)

Net change = (20)^2 / 100 = 4% decrease.

This question belongs to: Maths Percentage

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Question #1

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A student scored 42% marks and failed by 12 marks. Another student scored 58% marks and got 20 marks more than the passing marks. Find the maximum marks.

A. 180

B. 220

C. 200

D. 160

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Correct Answer: Option C

Explanation:
0.42M + 12 = 0.58M - 20 → 32 = 0.16M → M = 200.

This question belongs to: Maths Percentage

Question #2

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Price increased 15% then decreased 10%. Net change:

A. 3.5% increase

B. 5% increase

C. 5.5% increase

D. 4.5% increase

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Correct Answer: Option A

Explanation:
1.15×0.9 = 1.035, increase 3.5%.

This question belongs to: Maths Percentage

Question #3

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What is 50% of 88?

A. 22

B. 88

C. 66

D. 44

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Correct Answer: Option D

Explanation:
50% of 88 = (50 / 100) * 88 = 44.

This question belongs to: Maths Percentage

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