Question

if all the sides of a rectangle are increased by 40 % . then by what percentage does its area increase​

Answer 1

Answer:

80%

Step-by-step explanation:

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Answer 2

Answer: 96%

Step-by-step explanation:

Let the original are be lxb

Then,

40% of l = 2l/5

40% of b = 2b/5

(l + 2l/5) x (b + 2b/5)

= 7l/5 x 7b/5

= 49lb/25

Multiplying by 4 we get, 196/100

Before it was lb or 100lb/100

So the percentage has increased by 196-100 or 96 %