RRB Junior Engineer Stage 1 Model Papers 7

Question : 11 of 100

Marks: +1, -0

If the length of a rectangle is increased by 10% and its breadth is decreased by 10%, the change in its area will be

Solution:

Required change in area

=({-10×10}/100)=-1%

Negative sign shows a decrease.
Shortcut :

{-x^2}/100

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