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The percent change is the increase or decrease in the value of a quantity. If the new value is larger than the original value then it is a percent increase and if the change in value is lesser than the original value it is called percentage decrease.

For example, if a person has 25 dollars and he gets 3 more dollars and now has 28 dollars, its percentage increase is calculated as shown:

$\begin{array}{l}\text{Increase}=28-25=3\\ \%\text{change=r,then}\\ \frac{3}{25}=\frac{r}{100}\\ r=\frac{3}{25}脳100\\ =12\%\end{array}$

We are given that the Consumer price index in 2000 for dairy products was 160.7 and

in 2005, it was 182.4.

This is a percent of increase because the new amount is more than the original.

If we let x represent the percentage change then, we can find the amount of change as follows:

$\begin{array}{l}\text{Change:182.4-160.7=21.7points.}\\ \text{PercentChange:}\frac{21.7}{160.7}\left(100\%\right)\\ =0.135\left(100\%\right)\\ =13.50\%\end{array}$

Thus, the percent of change is 13.50%.