Question

The sides of the rectangle are20 cm and 15 cm .if each side of rectangle is increased by 20%,find the percentage ,increased in the area​

Answer 1

Answer:

given sides of rectangle are 20 cm length and 15 cm breadth

now area = 20 * 15 = 300 sq.cm

now each side is increased by 20%

then length= 20 + (20/100)20 = 20 + 2 = 24 cm

breadth= 15 + (20/100)15 = 15 + 3 = 18 cm

new area = 24 * 18 = 432 sq.cm

now percentage increased=

(432/300)100 - 100 = (1.44)100-100 = 144-100

= 44% is increase in area

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

L=20cm

B=15cm

Area=L×B

=20×15cm

2

=300cm

2

Newlength=20+20%of20

=20+

100

20

×20

=24cm

Newbreadth=15+20%of15

=15+

100

20

×15

=18cm

NewArea=24×18cm

2

=432cm

2

%ofAreaIncreased=

300

(432−300)

×100%

=

3

132

=44

Ans.44%