6Dec19 morning Q10

0. The length of the side ofa square (5.0cmx5.0cm) is increased by I %. By what percentage (%). the area of the square increases?

Answer
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Option : B
Explanation :
Area of the square = 5 x 5 = 25 cm²
When length is increases by 1 %.
Then, length of the square = 5 + (5x1)/100 = 5.05cm
Area of new square = (5.05) x (5.05) = 25.5025 cm²
Increase in area = 25.5025 - 25 = 0.5025
Percentage increase in area = (0.5025/25) x 100 = 2%

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