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. 2.5% increase

B. Cannot be determined

C. No change

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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The population of a town increases by 5% from 20,000. New population is:

A. 20,500

B. 21,000

C. 21,500

D. 22,000

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Correct Answer: Option B

Explanation:
20,000 × 1.05 = 21,000.

This question belongs to: Maths Percentage

Question #2

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A shopkeeper sells an article at 20% profit. Had he bought it at 10% less and sold it for Rs. 30 more, he would have gained 40%. Find the cost price.

A. Rs. 550

B. Rs. 500

C. Rs. 400

D. Rs. 450

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Correct Answer: Option B

Explanation:
CP=x, SP=1.2x. New CP=0.9x, new SP=1.2x+30 = 1.4×0.9x = 1.26x → 0.06x=30 → x=500.

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Question #3

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Price of an article reduced by 15%, new price Rs. 170. Original price was:

A. 200

B. 195

C. 190

D. 205

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Correct Answer: Option A

Explanation:
Original × 0.85 = 170 → original = 200.

This question belongs to: Maths Percentage

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