Hey, so you're having trouble calculating? I can understand you, since I have a similar problem at my job (when I calculate a budget), because my phone just can't calculate the percentage of money I need. However, since this interested me (I decided to fix this situation) , I started searching various forums for information about it and found an article about the "best tips about how to work out percentage increase" that helped me to calculate the percentage fast (cause of the simple interface of the source) which leads me to a correct answer. So I am really grateful that I found it for that reasons.