Percent Change Visualized with Area
- James R Olsen
Percent change is an important concept. In these GeoGebra files one can experiment with various percent increases and decreases. One percent change and be performed or a percent change followed by another percent change. A key is the compound effect of two percent changes. You will notice, for example, that:
- a 20% increase, followed by another 20% increase is not the same as a 40% increase,
- a 20% decrease, followed by another 20% decrease is not the same as a 40% decrease,
- a 20% increase, followed by a 20% decrease does not take the number back to the original number.