-47.2% is the change from 125 to 66
Calculation steps:
[( 66 - 125 ) ÷ 125] x 100 = -47.2%
Formula
Percentage change = [(66 - 125) / 125] x 100
Subtract the new number by the original number
66 - 125 = -59
-59 ÷ 125 = -0.472
-0.472 x 100 = -47.2%
Example