This video is intended to help you understand how to solve percent problems involving percent of change: percent of increase and decrease.

CORRECTION: The original problem was "The price of a notebook increased from P9.00 to P12.00. What is the percent of change of the notebook?" as seen at 0:40 of the video.
The problem was changed to "The price of a notebook increased from P10.00 to P12.00. What is the percent of change of the notebook?"

Please be guided that the changes made do not necessarily affect the solution and the answer. Thank you!