If the length of a rectangle is increased by 25% and the breadth is decreased by 20%, what is the percentage change in its perimeter? MCQ with Answer and Explanation

Question

If the length of a rectangle is increased by 25% and the breadth is decreased by 20%, what is the percentage change in its perimeter?

A. No change

B. Cannot be determined

C. 2.5% increase

D. 5% increase

Answer: Option B

Solution (By JKSSB Mock Tests)

Perimeter change depends on the original values of length and breadth, so cannot be determined without them.

This question belongs to: Maths Percentage

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Question #1

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Income Rs. 20000, spends 60%. Income rises 25%, savings to increase 50%. % increase in expenditure:

A. 8.33%

B. 10%

C. 6.25%

D. 12.5%

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Correct Answer: Option A

Explanation:
Initial: inc 20000, exp 12000, sav 8000. New inc 25000, sav 12000, exp 13000. Increase 1000 on 12000 = 8.33%.

This question belongs to: Maths Percentage

Question #2

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A number is increased by 40% and then decreased by 40%. If the resulting number is 84, find the original number.

A. 100

B. 90

C. 120

D. 110

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Correct Answer: Option A

Explanation:
1.4 × 0.6 = 0.84, 0.84x=84 → x=100.

This question belongs to: Maths Percentage

Question #3

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Two numbers are 20% and 50% more than a third number. Their ratio is:

A. 4:5

B. 5:4

C. 6:7

D. 5:6

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Correct Answer: Option A

Explanation:
Third = 100, first = 120, second = 150, ratio = 120:150 = 4:5.

This question belongs to: Maths Percentage

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