Q20 of 24 Page 213

The sides of a rectangle are 20cm and 15cm. If each side of the rectangle is increased by 20% find the percentage increase in the area?

Given


Length of Rectangle = 20cm


Breadth of Rectangle = 15cm


∴ The Area of rectangle will be


⇒ Length x Breadth = 20 x 15 = 300cm2


Side of Rectangle are increased by 20%



∴ The length of Rectangle becomes = 20 + 4 = 24cm



∴ The Breadth of Rectangle becomes = 15 + 3 = 18 cm


∴ The Area of rectangle will be


⇒ Length x Breadth = 24 x 18 = 432cm2


∴ Increase in Area = Final Area – Initial Area


= 432 – 300


= 132cm2




∴ The Area of Rectangle is increased by 44%.


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