Aptitude | Mensuration 2D | Question 7

If an error of 10% excess is made in calculating the side of a square, the % error in its area is
(A) 21
(B) 121
(C) 40
(D) 60

Answer: (A)

Explanation: Area of square = L2
=(1.1L)2 = 1.21 L2
=21 %

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