-80% is the change from 625 to 125
Calculation steps:
[( 125 - 625 ) ÷ 625] x 100 = -80%
Formula
Percentage change = [(125 - 625) / 625] x 100
Subtract the new number by the original number
125 - 625 = -500
-500 ÷ 625 = -0.8
-0.8 x 100 = -80%
Example