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# If the sides of a square increase by 10%, how much will the area be

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Manager
Joined: 26 Nov 2018
Posts: 96
Concentration: Technology, Entrepreneurship
GPA: 3.3
WE: Manufacturing and Production (Manufacturing)
If the sides of a square increase by 10%, how much will the area be  [#permalink]

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10 Mar 2019, 00:02
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Difficulty:

15% (low)

Question Stats:

100% (00:37) correct 0% (00:00) wrong based on 13 sessions

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If the sides of a square increase by 10%, how much will the area be increased in percentage?

A. 20%
B. 21%
C. 22%
D. 23%
E. 24%
Manager
Joined: 21 Feb 2019
Posts: 125
Location: Italy
If the sides of a square increase by 10%, how much will the area be  [#permalink]

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10 Mar 2019, 06:46
$$l_1 = l + 0.1l = 1.1 l$$

$$A_1 = (l_1)^2 = (1.1l)^2 = 1.21l^2$$

Hence, $$\frac{1.21 -1}{1} = 0.21$$

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If the sides of a square increase by 10%, how much will the area be   [#permalink] 10 Mar 2019, 06:46
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