-81.9% is the change from 685 to 124
Calculation steps:
[( 124 - 685 ) ÷ 685] x 100 = -81.9%
Formula
Percentage change = [(124 - 685) / 685] x 100
Subtract the new number by the original number
124 - 685 = -561
-561 ÷ 685 = -0.8189781021897811
-0.8189781021897811 x 100 = -81.9%