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

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

A. 0%

B. 1% decrease

C. 1% increase

D. 2% decrease

Answer: Option B

1.1×0.9 = 0.99, 1% decrease.

This question belongs to: Maths Percentage

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Question #1 Report Error

The price of an article is increased by r% and then decreased by r%. If the net decrease is 1%, find r.

A. 5

B. 8

C. 12

D. 10

Correct Answer: Option D

Explanation:
1 - r²/10000 = 0.99 → r² = 100 → r = 10.

This question belongs to: Maths Percentage

Question #2 Report Error

A 20% reduction in the price of sugar enables a man to buy 2 kg more for Rs. 60. The original price per kg is:

A. Rs. 7.5

B. Rs. 5

C. Rs. 8

D. Rs. 6

Correct Answer: Option A

Explanation:
Let original price x. 60/x + 2 = 60/(0.8x). Multiply: 60+2x = 75 → 2x=15 → x=7.5.

This question belongs to: Maths Percentage

Question #3 Report Error

A man sells two articles for Rs. 120 each. On one he gains 20%, and on the other he loses 20%. Find his overall profit or loss percent.

A. No profit no loss

B. 1% loss

C. 2% loss

D. 4% loss

Correct Answer: Option D

Explanation:
CP1 = 120/1.2=100, CP2=120/0.8=150. Total CP=250, SP=240. Loss=10, %=(10/250)×100=4% loss.

This question belongs to: Maths Percentage