Salary increased by 20% then decreased by 20%. Net effect: MCQ with Answer and Explanation

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Salary increased by 20% then decreased by 20%. Net effect:

A. 2% decrease

B. No change

C. 4% decrease

D. 4% increase

Answer: Option C

Solution (By JKSSB Mock Tests)

1.2 × 0.8 = 0.96, 4% decrease.

This question belongs to: Maths Percentage

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Question #1

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Price of petrol increased by 30%. To keep expenditure same, consumption must reduce by:

A. 30%

B. 23.08%

C. 20%

D. 25%

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Correct Answer: Option B

Explanation:
Reduction % = (30/130)×100 ≈ 23.08%.

This question belongs to: Maths Percentage

Question #2

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A mixture contains 25% alcohol. In 80 litres, amount of alcohol is:

A. 16 L

B. 18 L

C. 20 L

D. 22 L

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Correct Answer: Option C

Explanation:
25% of 80 = 20 litres.

This question belongs to: Maths Percentage

Question #3

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15% of a number is 45. 50% of that number is:

A. 120

B. 150

C. 130

D. 140

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Correct Answer: Option B

Explanation:
Number = 45/0.15 = 300; 50% of 300 = 150.

This question belongs to: Maths Percentage

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