Why 25%

In this post...
http://ibdindex.blogspot.com/2008/03/case-for-multiple-exits.html
I used a 25% trailing stop in the last example. There is nothing magical about this number and you should feel free to use whatever you want, just consider the following:

A 5% pullback requires a 5.26% gain to get back even.
A 10% pullback requires a 11.11% gain to get back even.
A 15% pullback requires a 17.65% gain to get back even.
A 20% pullback requires a 25% gain to get back even.
A 25% pullback requires a 33.33% gain to get back even.
A 33.3% pullback requires a 50% gain to get back even.
A 50% pullback requires a 100% gain to get back even.