# Percent Change (Increase or Decrease)

In this video, we will be learning how to determine percent change.

Percent Change Formula: $\frac{New Value - Original Value}{Original Value}\cdot100\%=Percent Change$

For example:

The price of gas was originally $5. The new price for gas is$4. What is the percent change?

$\frac{New Value - Original Value}{Original Value}\cdot100\%=Percent Change$

$\frac{(4) - (5)}{(5)}\cdot100\%=Percent Change\leftarrow$ Substitute the givens

$\frac{(4) - (5)}{(5)}\cdot100\%=Percent Change\leftarrow$ Simplify

$\frac{-1}{5}\cdot100\%=Percent Change$

$-20\%=Percent Change$
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Used by students across the country. Pre-Algebra, Algebra I, Geometry, & Algebra II