-80.66% is the change from 641 to 124
Calculation steps:
[( 124 - 641 ) ÷ 641] x 100 = -80.66%
Formula
Percentage change = [(124 - 641) / 641] x 100
Subtract the new number by the original number
124 - 641 = -517
-517 ÷ 641 = -0.8065522620904836
-0.8065522620904836 x 100 = -80.66%