-28.41% is the change from 894 to 640
Calculation steps:
[( 640 - 894 ) ÷ 894] x 100 = -28.41%
Formula
Percentage change = [(640 - 894) / 894] x 100
Subtract the new number by the original number
640 - 894 = -254
-254 ÷ 894 = -0.2841163310961969
-0.2841163310961969 x 100 = -28.41%