GATE | GATE 2017 MOCK II | Question 4

If we increase the sides of a rectangular park by 20% , then, what is the total increase in the area of that park ?
(A) 21 %
(B) 33 %
(C) 42 %
(D) 44 %


Answer: (D)

Explanation: Let length of park = L and breadth of park = B
Original Area = BL m2
New Length = 120L/100 = 6L/5
New Breadth = 120B/100 = 6B/5

New Area = 36LB/25 m2
so, Change in area = New – Original = 11LB/25 m2
% increase = Change / original * 100 = 44%


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