The price of a commodity is increased by x% then decreased by x%. Net decrease is 9%. 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 9%. Find x.

A. 30

B. 25

C. 35

D. 20

Answer: Option A

Solution (By JKSSB Mock Tests)

1 - x²/10000 = 0.91 → x² = 900 → x = 30.

This question belongs to: Maths Percentage

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Practice More Percentage Questions

Question #1

What percent of 80 is 20?

A. 25%

B. 30%

C. 15%

D. 20%

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Correct Answer: Option A

Explanation:
(20/80) × 100 = 25%.

This question belongs to: Maths Percentage

Question #2

If 50% of a number is added to another, second becomes 140% of itself. Ratio of first to second:

A. 2:5

B. 5:4

C. 4:5

D. 3:5

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Correct Answer: Option C

Explanation:
0.5F + S = 1.4S → 0.5F = 0.4S → F/S = 0.4/0.5 = 4/5.

This question belongs to: Maths Percentage

Question #3

In 60 L of milk-water mixture, water is 10%. How much water must be added to make water 25%?

A. 8 L

B. 12 L

C. 10 L

D. 6 L

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Correct Answer: Option B

Explanation:
Water = 6 L, milk = 54 L. For water 25%, milk 75%, total = 54/0.75 = 72 L, add 12 L.

This question belongs to: Maths Percentage

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