If the side of a square increases by 20%, then what will be percent increase in its perimeter?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 20%
Let side of square be 100 unit
A/C to question side of square has been increased by 20%
100 + 100 × 20% = 120 unit
Perimeter of square = 4 × side
Initial perimeter of square = 4 × 100 = 400
Increased perimeter of square = 4 × 120 = 480
% Increase = (480 - 400) × 100/400
% Increase = 80/4 = 20%