Teacher2Teacher 
Q&A #5442 
View entire discussion [<< prev] [ next >>]
From: John <jecwobble@ispwest.com> To: Teacher2Teacher Public Discussion Date: 2002111209:07:20 Subject: Increase vs. decrease I like the simplicity of "(new  old)/old" and in fact have used that myself to remember the principle. My question is in regard to the percentage of change when the old number is a negative value. Let's say you are comparing annual net earnings. In 2000, your company was in the red $50 (just to keep it simple), but in 2001 your company was in the black $200. That's a $250 increase which logic would say was a 500% increase. However the simple formula above returns a 500% decrease: (200  (50))/50 = 5 Should the formula actually be "(new  old)/absolute value(old)"?
Post a reply to this message

[Privacy Policy] [Terms of Use]
Math Forum Home 
The Math Library 
Quick Reference 
Math Forum Search