Length +10%, breadth -10%. Change in area: MCQ with Answer and Explanation

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Length +10%, breadth -10%. Change in area:

A. 1% decrease

B. 2% decrease

C. 0%

D. 1% increase

Answer: Option A

Solution (By JKSSB Mock Tests)

1.1×0.9 = 0.99, 1% decrease.

This question belongs to: Maths Percentage

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Question #1

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Value of a scooter depreciates 10% per year. Price 40,000, after 1 year value is:

A. 37,000

B. 36,000

C. 34,000

D. 35,000

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Correct Answer: Option B

Explanation:
40,000 × 0.9 = 36,000.

This question belongs to: Maths Percentage

Question #2

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

A. 30%

B. 20%

C. 25%

D. 33.33%

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Correct Answer: Option C

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

This question belongs to: Maths Percentage

Question #3

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A number is 30% of another number. If the sum of the numbers is 390, find the larger number.

A. 250

B. 300

C. 270

D. 260

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Correct Answer: Option B

Explanation:
Let larger x, smaller 0.3x. 1.3x = 390 → x=300.

This question belongs to: Maths Percentage

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