RRB Group D Model Paper 10 with solutions

Question : 8 of 100

Marks: +1, -0

The length of a rectangle is increased by 10% and its breath is decreased by 10%. The area of the new rectangle is

Solution:

(4) The decrease or increase in the area can be found by successive percentage rule, i.e. a + b +

{ab}/100

.
Increase or decrease in area of the new rectangle
10 - 10 +

{-10×10}/100

= - 1%
Thus, the area will decrease by 1%.

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