-81.35% is the change from 665 to 124
Calculation steps:
[( 124 - 665 ) ÷ 665] x 100 = -81.35%
Formula
Percentage change = [(124 - 665) / 665] x 100
Subtract the new number by the original number
124 - 665 = -541
-541 ÷ 665 = -0.8135338345864662
-0.8135338345864662 x 100 = -81.35%