A salary is increased by 30% and then decreased by 30%. What is the net change? MCQ with Answer and Explanation

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A salary is increased by 30% and then decreased by 30%. What is the net change?

A. 0%

B. 9% decrease

C. 6% decrease

D. 9% increase

Answer: Option B

Solution (By JKSSB Mock Tests)

Net change = x^2 / 100 % decrease. 30^2 / 100 = 900 / 100 = 9% decrease.

This question belongs to: Maths Percentage

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Question #1

A's salary increased by 20% then decreased by 20%. Original salary 5000, final salary:

A. 5000

B. 4800

C. 4600

D. 5200

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Correct Answer: Option B

Explanation:
5000 × 1.2 × 0.8 = 4800.

This question belongs to: Maths Percentage

Question #2

A student scored 30% marks and failed by 45 marks. Another scored 42% marks and got 45 more than pass. Pass marks:

A. 225

B. 300

C. 270

D. 250

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Correct Answer: Option C

Explanation:
0.3M + 45 = 0.42M - 45 → 0.12M = 90 → M=750. Pass = 0.3×750+45 = 270.

This question belongs to: Maths Percentage

Question #3

Decrease 900 by 30%. Result is:

A. 610

B. 620

C. 630

D. 600

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Correct Answer: Option C

Explanation:
900 × 0.7 = 630.

This question belongs to: Maths Percentage

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