-81.58% is the change from 673 to 124
Calculation steps:
[( 124 - 673 ) ÷ 673] x 100 = -81.58%
Formula
Percentage change = [(124 - 673) / 673] x 100
Subtract the new number by the original number
124 - 673 = -549
-549 ÷ 673 = -0.8157503714710252
-0.8157503714710252 x 100 = -81.58%