> The interval for -20%-0% is the same length as that for 0%-25%. So, the transformation is not symmetric around 0. It is. +0% is 1.0, -20% is 0.8, and +25% is

> The interval for -20%-0% is the same length as that for 0%-25%. So, the transformation is not symmetric around 0. It is. +0% is 1.0, -20% is 0.8, and +25% is 1.25. 0.8, 1.0, and 1.25 are a geometric progression (x1.25)