Watch and take Cornell Notes on the following videos
VIDEO #1 -- What is Percent of Change?
http://www.virtualnerd.com/pre-algebra/percents/change/change-examples/percent-change-definition
VIDEO #2 -- How do you solve for Percent of Change?
http://www.virtualnerd.com/pre-algebra/percents/proportion/proportion-examples/percent-proportion-word-problem-example