-80.72% is the change from 643 to 124
Calculation steps:
[( 124 - 643 ) ÷ 643] x 100 = -80.72%
Formula
Percentage change = [(124 - 643) / 643] x 100
Subtract the new number by the original number
124 - 643 = -519
-519 ÷ 643 = -0.807153965785381
-0.807153965785381 x 100 = -80.72%