SOLUTION: If each side of a square be increased by 10% the percentage increase in area is

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Question 1069459: If each side of a square be increased by 10% the percentage increase in area is
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let say the side of the square is s.
The area is then A%5B1%5D=s%5E2.
Increasing the side by 10% makes the side %281%2B10%2F100%29s=1.1s
So the area is now A%5B2%5D=%281.1s%29%5E2=1.21s%5E2
So then,
%28%28A%5B2%5D-A%5B1%5D%29%2FA%5B1%5D%29%2A100=%28%281.21s%5E2-s%5E2%29%2Fs%5E2%29%2A100=21
21% increase