Price of a commodity falls by 20%. To keep expenditure constant, consumption must increase by: MCQ with Answer and Explanation

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Price of a commodity falls by 20%. To keep expenditure constant, consumption must increase by:

A. 15%

B. 20%

C. 25%

D. 30%

Answer: Option C

Solution (By JKSSB Mock Tests)

New price 0.8, consumption multiplier needed = 1/0.8 = 1.25, increase 25%.

This question belongs to: Maths Percentage

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Question #1

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A man spends 40% of his income on food, 30% of the remainder on rent, and saves the rest. If he saves Rs. 3780, find his income.

A. Rs. 8000

B. Rs. 9600

C. Rs. 8400

D. Rs. 9000

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Correct Answer: Option D

Explanation:
Food 40%, left 60%. Rent 30% of 60% = 18% of income. Total spend = 58%, save 42% = 3780 → income = 3780/0.42 = 9000.

This question belongs to: Maths Percentage

Question #2

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A man spends 30% of income on rent, 25% of remainder on food, 20% of remainder on education, saves Rs. 12600. Income:

A. 32000

B. 28000

C. 25000

D. 30000

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Correct Answer: Option D

Explanation:
Rent 0.3I, left 0.7I. Food 0.175I, left 0.525I. Education 0.105I, left 0.42I = 12600 → I = 30000.

This question belongs to: Maths Percentage

Question #3

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What is 10% of 200?

A. 10

B. 30

C. 40

D. 20

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Correct Answer: Option D

Explanation:
10% of 200 = (10 / 100) * 200 = 20.

This question belongs to: Maths Percentage

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