This document provides examples and explanations for calculating percent of increase and percent of decrease. It defines percent of change as the amount of change divided by the original amount. Several examples are given of calculating the percent of increase or decrease in different scenarios. These include finding the percent increase from 4 to 7.5 (87.5%), the annual increase in video game production from 1960 to 1990 (about 133%), and the percent decrease when a computer costs dropped from $875 to $745 (14%).