Question

The length and breadth of a rectangle is 80 m
and 40 m, respectively. If the length and
increases by 5% and the breadth decreases
by 5%. What will be the difference in
perimeter ?​

Answer 1

Step-by-step explanation:

l = 80m, b =40m

perimeter = 2(l+b)=2×(80+40)=120×2=240

l=80 m

length increases by 5%

80x(1+5%)= 80×(1+0.05)=80×1.05=84

b= 40m

breadth decreases by 5%

40×(1-5%)=40×(1-0.05)=40×0.95=38

new perimeter =2×(84+38)=244

difference = 244-240=4