Question

The side of a square is increased by 35% find the percentage gain in area

Answer 1

Answer:

 a variable X changes by A% and another variable Y changes by B%, then overall net change when the two variables are multiplied is given by :

A + B + AB/100

If the change is “increase” it is positive & if the change is “decrease” it is negative.

so for increasing 50% in side so

according to above concept

What will be increase in area of a circle if radius is increased by 50% ?

Ans : 50 + 50 + (50 x 50)/100 = 125%

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