If the price of petrol increases by 40%, by what percent must a person reduce consumption so that expenditure increases by only 12%? MCQ with Answer and Explanation

Question

If the price of petrol increases by 40%, by what percent must a person reduce consumption so that expenditure increases by only 12%?

A. 18%

B. 22%

C. 20%

D. 15%

Answer: Option C

Solution (By JKSSB Mock Tests)

1.4 × x = 1.12 → x = 0.8, reduction 20%.

This question belongs to: Maths Percentage

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Question #1

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A man's monthly salary is Rs. 20000. He spends 20% on rent and 30% of the remaining on food. How much does he save?

A. 11200

B. 12000

C. 10000

D. 14000

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Correct Answer: Option A

Explanation:
Remaining after rent = 80% of 20000 = 16000. Spent on food = 30% of 16000 = 4800. Savings = 16000 - 4800 = 11200.

This question belongs to: Maths Percentage

Question #2

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A shopkeeper marks his goods 25% above cost price and allows a discount of 10%. His gain percent is:

A. 12.5%

B. 15%

C. 10.5%

D. 17.5%

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Correct Answer: Option A

Explanation:
CP=100, MP=125, SP=112.5, gain 12.5%.

This question belongs to: Maths Percentage

Question #3

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

A. 35

B. 25

C. 20

D. 30

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Correct Answer: Option D

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

This question belongs to: Maths Percentage

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