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. 6% decrease

B. 9% increase

C. 0%

D. 9% decrease

Answer: Option D

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

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The value of a machine is 10,000. It depreciates by 10% annually. What will be its value after 2 years?

A. 8200

B. 9000

C. 8000

D. 8100

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Correct Answer: Option D

Explanation:
Value = P * (1 - R/100)^t = 10000 * (0.90)^2 = 10000 * 0.81 = 8100.

This question belongs to: Maths Percentage

Question #2

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If A is 25% less than B, then B is what percentage more than A?

A. 33.33%

B. 50%

C. 20%

D. 25%

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Correct Answer: Option A

Explanation:
Formula: (25 / 75) * 100 = (1 / 3) * 100 = 33.33%.

This question belongs to: Maths Percentage

Question #3

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If the radius of a circle is decreased by 30%, the area decreases by:

A. 42%

B. 49%

C. 60%

D. 51%

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Correct Answer: Option D

Explanation:
New area = 0.7² = 0.49, decrease 51%.

This question belongs to: Maths Percentage

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