The percentage increase in the area of a rectangle, if each of its sides is increased by 20% is:
Select
A) 44%  B) 46%  C) 48%  D) 50%  E) 51%
Let original length = x metres and original breadth = y metres.   Original area = (xy) m2.   New length = 120 x m = 6 x m.   100 5   New breadth = 120 y m = 6 y m.   100 5   New Area = 6 x x 6 y m2 = 36 xy m2.   5 5 25   The difference between the original area = xy and new-area 36/25 xy is   = (36/25)xy - xy   = xy(36/25 - 1)   = xy(11/25) or (11/25)xy   Increase % = 11 xy x 1 x 100 % = 44%.   25 xy   44%
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The percentage increase in the area of a rectangle, if each of its sides is increased by 20% is: