Multiple choice

The length and breadth of a rectangle are increased by 30% and 20% respectively. Find the net percentage change in its area.

  1. 23

  2. 34

  3. 50

  4. 12

  5. None of these
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Original area = L × B. New length = 1.3L (30% increase), new breadth = 1.2B (20% increase). New area = 1.3L × 1.2B = 1.56LB. Percentage change = (1.56 - 1) × 100 = 56% increase. None of the given options (23, 34, 50, 12) equal 56%, so 'None of these' (E) is correct. The correct answer should be 56% increase.

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