If a rectangle's length and width are both doubled, by what percent is the rectangle's area increased?

If a rectangle's length and width are both doubled, by what percent is the rectangle's area increased? Correct Answer 300%

Let the initial length and width be L and W respectively. Initial area = L×W New length = 2L New width = 2W New area = 2L×2W = 4 L×W Increase in area = (4 L×W - L×W) / (L×W) × 100% = 300%
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