Question

The length of rectangle is increased by 20% and Brett is increased by 10% find the percentage of increase in its area

Answer 1

Answer                            earlier                 new

length                              100                      120

breadth                            100                      110

area                                   10000                13200

percentage change = (13200-10000)/10000*100 = 32%

Step-by-step explanation:

Answer 2

Step-by-step explanation:

Let the Original length=l

original breadth=b

original area= l ×b

New area:

new length=(120/100)×l

= 6l/5

new breadth=(140/100)×b

=7b/5

area= (6l/5)(7b/5)

=42lb/25

% increase = (new area- original area)×100/original area

=(((42lb/25)-lb)×100)/lb

=(((42lb - 25lb) /25 ) ×100)/lb

=((17lb/25)×100))/lb

=68 %

The percentage increase in its area is 68%