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The side of a square is increased from 20cm to 21cm. Calculate the percentage increase ...

The side of a square is increased from 20cm to 21cm. Calculate the percentage increase in its area
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  • A 2.5%
  • B 9.3%
  • C 10.0%
  • D 10.25%
Correct Answer: Option D
Explanation:
old area = 202 = 400
new area = 212 = 441
% increase in area \(=\frac{41}{400}\times \frac{100}{1}\\
=10.25\%\)

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