Each side of a rectangle is increased by 100% .By what percentage does the…

20252023

Each side of a rectangle is increased by 100% .By what percentage does the area increase?

  1. A.

    100%

  2. B.

    300%

  3. C.

    400 %

  4. D.

    Impossible to Calculate

Attempted by 1 students.

Show answer & explanation

Correct answer: B

Let the original length be L and the original breadth be B.

Original area = L × B.

Increasing each side by 100% means each dimension doubles:

  • New length = 2L

  • New breadth = 2B

New area = (2L) × (2B) = 4LB = 4 × (original area).

Percentage increase = ((new area − original area) / original area) × 100%.

Percentage increase = ((4A − A) / A) × 100% = (3A / A) × 100% = 300%.

Therefore, the area increases by 300%.

Explore the full course: Cognizant Preparation