-89.97% is the change from 668 to 67
Calculation steps:
[( 67 - 668 ) ÷ 668] x 100 = -89.97%
Formula
Percentage change = [(67 - 668) / 668] x 100
Subtract the new number by the original number
67 - 668 = -601
-601 ÷ 668 = -0.8997005988023952
-0.8997005988023952 x 100 = -89.97%