A number is increased by 20% and then decreased by 20%. What is the net change? MCQ with Answer and Explanation

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A number is increased by 20% and then decreased by 20%. What is the net change?

A. 2% decrease

B. 4% increase

C. 4% decrease

D. No change

Answer: Option C

Solution (By JKSSB Mock Tests)

Net change = x^2 / 100 % decrease. 20^2 / 100 = 400 / 100 = 4% decrease.

This question belongs to: Maths Percentage

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Question #1

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10% voters did not vote in an election. The winner got 60% of polled votes and won by 900 votes. Total voters:

A. 5500

B. 4500

C. 6000

D. 5000

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Correct Answer: Option D

Explanation:
Polled votes P=0.9T. Margin 0.2P = 900 → P=4500 → T=5000.

This question belongs to: Maths Percentage

Question #2

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A student multiplied a number by 5/3 instead of 3/5. What is the percentage error?

A. 150%

B. 177.77%

C. 64%

D. 100%

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Correct Answer: Option B

Explanation:
True = 3/5x. False = 5/3x. Error = (5/3 - 3/5)x = (16/15)x. % Error = ((16/15) / (3/5)) * 100 = (16/9) * 100 = 177.77%.

This question belongs to: Maths Percentage

Question #3

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Machine depreciates 15% per year. Present value Rs. 72,250, value 2 years ago was:

A. 1,00,000

B. 90,000

C. 95,000

D. 1,05,000

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Correct Answer: Option A

Explanation:
Value 2 years ago = 72250 / (0.85×0.85) = 72250 / 0.7225 = 1,00,000.

This question belongs to: Maths Percentage

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