Q. 18

# The length of a r

Answer :

Given: The percentage increment of the length of the rectangle=15%

The percentage decrement of the breadth of the rectangle=15%

Tip: if y is increased by x% then the new value of y is  : if y is decreased by x%, then the new value of y is  Let the length of the rectangle be “L” units.

Let the breadth of the rectangle be B units

Therefore, initially before any change in the lengths of both the length and breadth of the rectangle is

= Now, Using tip (i)

The new length of the rectangle will be:

=L units =L units

Now, Using tip (ii)

The new breadth of the rectangle will be:

=B units. =B units

Therefore, the new area of the rectangle will be:

=L B =LB  Therefore, the decrement in area= LB- LB  =LB Therefore, percentage decrement in area,

= = =2.25%

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