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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
  • 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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