-93.6% is the change from 641 to 41
Calculation steps:
[( 41 - 641 ) ÷ 641] x 100 = -93.6%
Formula
Percentage change = [(41 - 641) / 641] x 100
Subtract the new number by the original number
41 - 641 = -600
-600 ÷ 641 = -0.9360374414976599
-0.9360374414976599 x 100 = -93.6%