Question

8. The length and breadth of a rectangle is 80 m and 40 m, respectively. If the length increases by 5%
and the breadth decreases by 5%. What will be the difference in perimeter?
(1) 20 m
(2) 12 m
(3) 15 m
(4) 4 m
9. The perimeter of a rectangle is equal to the perimeter of a square. If the length and breadth​

Answer 1

$\huge\mathfrak\red{answer}$

L1= 80m

B1= 40m

Perimeter 1= 2(l+b)= 2(80+40)

= 240

L2= increase 5%

So, 5%of 80 = 5×80 = 4

100

L2= 80+4= 84

B2 = decrease 5%

So, 5% of 40 = 5×40 = 2

100

B2= 40 -2 =38

Perimeter 2= 2(l+b) = 2(84+38) = 224

Ratio= P1/P2= 240/244= 60:61