Price of a commodity falls by 15%. To keep expenditure constant, consumption must increase by: MCQ with Answer and Explanation

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Price of a commodity falls by 15%. To keep expenditure constant, consumption must increase by:

A. 20%

B. 15%

C. 17.64%

D. 18%

Answer: Option C

Solution (By JKSSB Mock Tests)

New price 0.85, consumption multiplier needed = 1/0.85 ≈ 1.17647, increase 17.64%.

This question belongs to: Maths Percentage

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Question #1

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A's salary is 50% of B's salary which is 40% of C's salary. What percent of C's salary is A's salary?

A. 15%

B. 30%

C. 20%

D. 25%

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Correct Answer: Option C

Explanation:
A = 0.5B, B = 0.4C → A = 0.5×0.4C = 0.2C = 20% of C.

This question belongs to: Maths Percentage

Question #2

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Price reduced 25%, enables buying 3 kg more for Rs. 90. Reduced price/kg:

A. Rs. 8

B. Rs. 6

C. Rs. 7

D. Rs. 7.5

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Correct Answer: Option D

Explanation:
Original price x, xy=90. New 0.75x(y+3)=90 → 0.75×90 + 2.25x=90 → x=10, reduced 7.5.

This question belongs to: Maths Percentage

Question #3

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Number increased by 30%. By what % should new number be decreased to get original?

A. 27.27%

B. 20%

C. 25%

D. 23.08%

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Correct Answer: Option D

Explanation:
Original 100, new 130. Decrease % = (30/130)×100 ≈ 23.08%.

This question belongs to: Maths Percentage

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