Price decreased by 10% then increased by 10%. Net change is: MCQ with Answer and Explanation

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Price decreased by 10% then increased by 10%. Net change is:

A. 2% decrease

B. 1% decrease

C. 1% increase

D. No change

Answer: Option B

Solution (By JKSSB Mock Tests)

0.9 × 1.1 = 0.99, so 1% decrease.

This question belongs to: Maths Percentage

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Question #1

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

A. 120

B. 100

C. 110

D. 130

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Correct Answer: Option A

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

This question belongs to: Maths Percentage

Question #2

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In an examination, 60% of students passed in Mathematics, 70% passed in Science, and 20% failed in both. What percentage passed in both subjects?

A. 60%

B. 50%

C. 70%

D. 40%

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Correct Answer: Option B

Explanation:
Passed in at least one subject = 100% - 20% = 80%. n(M U S) = n(M) + n(S) - n(M ∩ S). 80 = 60 + 70 - n(M ∩ S). n(M ∩ S) = 130 - 80 = 50%.

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Question #3

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Price of pen up 15%. By what % reduce consumption so that expenditure rises only 5%?

A. 10%

B. 8%

C. 9.09%

D. 8.7%

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Correct Answer: Option D

Explanation:
1.15 × x = 1.05 → x = 1.05/1.15 ≈ 0.91304, reduction = 8.7%.

This question belongs to: Maths Percentage

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