Mensuration Practice Test 5

Question : 27 of 40

Marks: +1, -0

In a rectangle, the length is increased by 10% and the breadth is decreased by 10%. The percentage change in area is:

Solution:

Let the length of the rectangle = l = 20 m
Breadth = b = 10 m
Length increased = 10%

l_1

= 22 m.
Breadth decreased = 10%

b_1

= 9 m.
Area of rectangle = l × b
= 20 × 10 m = 200

m^2

Area of rectangle = 1 1 l × b = 22 × 9 = 198

m^2

Percentage =

{-2}/{200} × 100

= - 1 %
Decreased percentage = 1%

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