-93.76% is the change from 641 to 40
Calculation steps:
[( 40 - 641 ) ÷ 641] x 100 = -93.76%
Formula
Percentage change = [(40 - 641) / 641] x 100
Subtract the new number by the original number
40 - 641 = -601
-601 ÷ 641 = -0.9375975039001561
-0.9375975039001561 x 100 = -93.76%