SOLUTION: a 100% increase followed by a 50% decrease .

Question 1135121: a 100% increase followed by a 50% decrease .
Found 2 solutions by greenestamps, MathTherapy:
Answer by greenestamps(13203) (Show Source): You can put this solution on YOUR website!

A 100% increase doubles the number; a 50% decrease cuts it in half.

One after the other (in either order!) gets you back to the original value.
Answer by MathTherapy(10555) (Show Source): You can put this solution on YOUR website!

a 100% increase followed by a 50% decrease.

100% increase results in 100% + 100%, or 1 + 1, or TWICE the ORIGINAL
50% decrease results in 50%, or .5 of the ABOVE
100% increase followed by a 50% reduction results in:
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