Math Homework Help Percentages

December 30th, 2010

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Question: Percentage increase – Maths homework help ?

Hi,
I’m really stuck on this one question and how you work it out. If anyone could help that would be great $:)$

The sides of a square are increased by 10%. By what percentage is the area increased?

Thanks in advance!

Answer: A = s² Let’s increase s by 10%: s + 10%s = s + 0.1s = 1.1s,

So the new increased area is A* = (1.1s)² =

1.21 s² =

1s² + .21s² = (and since s² = A)

A + .21A which is the original area increased by 21%.

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