If the price of petrol increases by 10%, by what percentage should a person decrease their usage to keep the budget unchanged? MCQ with Answer and Explanation

Question

If the price of petrol increases by 10%, by what percentage should a person decrease their usage to keep the budget unchanged?

A. 9.09%

B. 12%

C. 11.11%

D. 10%

Answer: Option A

Solution (By JKSSB Mock Tests)

Required decrease = (10 / 110) * 100 = 100 / 11 = 9.09%.

This question belongs to: Maths Percentage

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Question #1

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

A. 20%

B. 33.33%

C. 30%

D. 25%

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Correct Answer: Option D

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

This question belongs to: Maths Percentage

Question #2

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A shopkeeper gives 15% discount on marked price Rs. 800. Selling price is:

A. 700

B. 680

C. 650

D. 660

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Correct Answer: Option B

Explanation:
800 × 0.85 = 680.

This question belongs to: Maths Percentage

Question #3

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If x is 80% of y, what percentage of x is y?

A. 80%

B. 120%

C. 100%

D. 125%

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Correct Answer: Option D

Explanation:
x = 0.8y. Therefore, y = x / 0.8 = 1.25x. Thus, y is 125% of x.

This question belongs to: Maths Percentage

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