Question

The length and breadth of a rectangle is 80 m and 40m, respectively. If the length increases by 5 % and the breadth decreases by 5%. What will be the difference in perimeter? (a) 20m (b) 12m (c)15m (d) 4m​

Answer 1

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

Answer 2

Answer:

4 m

Step-by-step explanation:

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