From: Kimberley (for Teacher2Teacher Service)
Date: Jan 10, 2001 at 17:04:12
Subject: Re: Percentage of change

Pat's explanation about how to use percentages is great and I hope it helps 
you. The particular example you gave about finding a percentage of change can 
be classified as a fourth type of percentage problem (the others being 
finding the part, finding the whole, or finding the percentage).

You might be interested in a mnemonic device developed by my freshmen
students for remembering how to do this type. They used "(new - old)/ old".
This gives a decimal form which can easily be written as a percentage.

Old refers to the original price (in your problem); new refers to the current
price. A positive answer means there was a percentage of increase, a negative 
means a percentage of decrease.

 -Kimberley, for the T2T service

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