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

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

A. No change

B. 4% decrease

C. 10% decrease

D. 4% increase

Answer: Option B

Solution (By JKSSB Mock Tests)

Let the number be 100. After 20% increase, it becomes 120. After 20% decrease, it becomes 120 * 0.8 = 96. Net change = 100 - 96 = 4% decrease.

This question belongs to: Maths Percentage

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Question #1

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A number is increased by 40% and then decreased by 40%. If the resulting number is 84, find the original number.

A. 100

B. 90

C. 120

D. 110

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Correct Answer: Option A

Explanation:
1.4 × 0.6 = 0.84, 0.84x=84 → x=100.

This question belongs to: Maths Percentage

Question #2

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If a number increased by 25% is 150, what is the original number?

A. 100

B. 120

C. 110

D. 130

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Correct Answer: Option B

Explanation:
Let the number be x. x * 1.25 = 150. x = 150 / 1.25 = 120.

This question belongs to: Maths Percentage

Question #3

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Kerosene price up 20%. To keep expenditure same, reduce consumption by:

A. 16.67%

B. 18%

C. 15%

D. 20%

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Correct Answer: Option A

Explanation:
Reduction = (20/120)×100 = 16.67%.

This question belongs to: Maths Percentage

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