**Determining Percent Change
of Tabulated Data or Graphed Lines**

**Percent change is used to determine amount of
change from beginning to end. It is useful in comparing different data sets
where the starting numbers (or total numbers) are not the same, or graphed lines
where the slopes of the individual lines are nearly identical. Calculating the
percent change allows us to compare how several different sets of numerical
data are changing in a numerical way. **