Question

The length and breadth of a rectangle is 80 m. and 40 m. respectively. if the length is increased by 5% and breadth is decreased by 5% . then what will be the difference in perimeter​

Answer 1

Answer:

Difference in Perimeter = 4m

Step-by-step explanation:

Now Perimeter = 2(l+b) = 240m

Later Perimeter = 2(1.05l+0.95b) = 2(84+38)

= 244m

So, difference in Perimeter = 4m

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Answer 2

Answer:

length 80cm

breadth 40 cm

perimeter of rectangle = 2(l+b)

= 2(80+40)cm

=2×120cm

=240cm

New length 80+5% of 80

80+5/100×80 cm

80+4cm

84cm

New breadth 40-5%of 40cm

40-5/100×40cm

40-2 cm

38 cm

perimeter of New rectangle=2 (l+b)

2(84+38)cm

2×122 cm

244 cm

difference between =244-240cm

4 cm