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If x is increased by 30% and then decreased by 30%, the result is what percent of x?

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Trap answer: result = 100% of x

It is a mistake to add and subtract percent increase and decreases: in particular, a percent increase and percent decrease of the same numerical value do no cancel.

In fact, we have to use multipliers.
result = (1.30)*(0.70)*x = 0.91x
Answer = 91% of x

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