HP12C SOYD function:
I use the soyd function to calculate the percentage variation between two numbers.
$1200 -> $1700 Clearly, we have an increase of 41,67%.
But if I type $1700 first and then $1200. $1700 -> $1200 The HP12C returns -29,41%.
Why is that?
I used to think any variation would result the same percentage, I don't understand where -29,41% comes from.
Thanks in advance.