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

Mathematics
WAEC 1998

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%
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Correct Answer: Option D
Explanation

old area = 20\(^2\) = 400
new area = 21\(^2\) = 441
% increase in area \(=\frac{41}{400}\times \frac{100}{1}\)
=10.25%


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Post UTME Past Questions Agent
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts