If the price of rice decreases by 20%, by what percentage can consumption be increased without changing expenditure? MCQ with Answer and Explanation

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If the price of rice decreases by 20%, by what percentage can consumption be increased without changing expenditure?

A. 25%

B. 30%

C. 20%

D. 33.33%

Answer: Option A

Solution (By JKSSB Mock Tests)

Required increase = (R / (100 - R)) * 100. (20 / 80) * 100 = 25%.

This question belongs to: Maths Percentage

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Question #1

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A and B can do a work in 12 days. B and C in 15 days. A and C in 20 days. If A, B, and C work together, how long will they take?

A. 11 days

B. 8 days

C. 9 days

D. 10 days

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Correct Answer: Option D

Explanation:
2(A+B+C) = 1/12 + 1/15 + 1/20 = (5+4+3)/60 = 12/60 = 1/5 → A+B+C = 1/10. Together 10 days.

This question belongs to: Maths Percentage

Question #2

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A man's salary is increased by 12% and then decreased by 12%. Find the net change in his salary.

A. 1.44% decrease

B. 2.4% decrease

C. 1.44% increase

D. No change

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Correct Answer: Option A

Explanation:
1.12 × 0.88 = 0.9856, decrease 1.44%.

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Question #3

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The price of an article is increased by 25% and then decreased by x%. If the net effect is no change, find x.

A. 20

B. 30

C. 22.5

D. 25

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Correct Answer: Option A

Explanation:
1.25 × (1 - x/100) = 1 → 1 - x/100 = 0.8 → x/100 = 0.2 → x=20.

This question belongs to: Maths Percentage

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