The price of a commodity is increased by x% then decreased by x%. Net decrease is 4%. Find x. MCQ with Answer and Explanation

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The price of a commodity is increased by x% then decreased by x%. Net decrease is 4%. Find x.

A. 10

B. 20

C. 25

D. 15

Answer: Option B

Solution (By JKSSB Mock Tests)

(1+x/100)(1-x/100) = 0.96 → 1 - x²/10000 = 0.96 → x² = 400 → x = 20.

This question belongs to: Maths Percentage

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Question #1

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A number is 50% more than another number. If the smaller number is 60, what is 40% of the larger number?

A. 40

B. 30

C. 36

D. 45

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Correct Answer: Option C

Explanation:
Larger = 60 × 1.5 = 90, 40% of 90 = 36.

This question belongs to: Maths Percentage

Question #2

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150% of 60 is:

A. 80

B. 75

C. 90

D. 100

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Correct Answer: Option C

Explanation:
1.5 × 60 = 90.

This question belongs to: Maths Percentage

Question #3

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The salary of a person was first increased by 20% and then decreased by 20%. If his original salary was Rs. 5000, what is his final salary?

A. Rs. 4800

B. Rs. 4920

C. Rs. 4600

D. Rs. 4900

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Correct Answer: Option A

Explanation:
5000 × 1.2 × 0.8 = 5000 × 0.96 = 4800.

This question belongs to: Maths Percentage

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