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  1. If the side of a square is increased by 25%, then its area is increased by :
    1. 25%
    2. 55%
    3. 40.5%
    4. 56.25%
Correct Option: D

Using Rule 12,
Let the side of a square is increased by x %, its area is increased by

= 2x² +
x²
%
100

Here, x = 25%
∴ Effective increase in area = 2 × 25 +
25 × 25
% = 56.26%
100


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