If the length of a rectangle is increased by 20% and width is decreased by 20% what is the change in area of the rectangle?

If the length of a rectangle is increased by 20% and width is decreased by 20% what is the change in area of the rectangle? Correct Answer decreases by 4%

Shortcut technique: ( + 20) + ( - 20) + ( + 20)x( - 20)/100 = - 4. Therefore, the area will be decreased by 4%.
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