Question:
is there a standard or most correct way to calculate
Percent Change?

Replies:
I have always calculated percentages in the following way:
what is the percent change, when the temperature (for example) rises from
100 to 101
((101-100)/100 )x 100% = 1% or when is the percent change when the
temperature falls from 101 to 100, ((100-101)/101) x 100% = 0.99%.

That's it.

Dr.Myron
Hello,

The way a percentage change is determined is standard and is:
% change =100 x ((new value-original value)/original value).

You can always avoid the confusion by carefully state the reference point
(= original value). For example, saying that "the population of California
has increased 8% in the past ten years" is quite unambiguous.

AK

Dr. Ali Khounsary
Advanced Photon Source
Argonne National Laboratory
Argonne, IL 60439

NEWTON is an electronic community for Science, Math, and Computer Science K-12 Educators, sponsored and operated by Argonne National Laboratory's Educational Programs, Andrew Skipor, Ph.D., Head of Educational Programs.