How to solve percent of change

Percent of change = amount of error/actual value * 100

A percent of change is a ratio that compares the change in quantity to the original amount.

Equation:

percent of change = final amount - original amount/original amount

Ex: 9.25 - 6.50/9.25 * 100

= 2.75/9.25 * 100

=.29729729722973 * 100

= 29.7 % decrease

Ex: 7.5 - 4 / 7.5 * 100

= 3.5/4 * 100

= 0.875 * 100

= 87.5 % increase