SOLUTION: Each side of a rectangle is increased by 100% .By what percentage does the area increase?

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Question 262689: Each side of a rectangle is increased by 100% .By what percentage does the area increase?
Answer by mananth(16946) About Me  (Show Source):
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Each side of a rectangle is increased by 100% .By what percentage does the area increase?
Let length be x & and width be y
Area = xy
Increase in 100% means the length doubles
2x * 2y
4xy
4xy/xy * 100 = 400%
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