How to calculate percentage change or difference between two numbers in Excel?
How to Calculate Percentage Increase in Excel - Sheetaki
Calculating Percentage Change - YouTube
Corbettmaths on Twitter: "Percentage Change: you may be asked to calculate percentage increase/decrease etc http://t.co/A0xEOnea1b http://t.co/PqB5VUO37K" / Twitter
How to increase an amount by a percentage - BBC Bitesize