-89.82% is the change from 668 to 68
Calculation steps:
[( 68 - 668 ) ÷ 668] x 100 = -89.82%
Formula
Percentage change = [(68 - 668) / 668] x 100
Subtract the new number by the original number
68 - 668 = -600
-600 ÷ 668 = -0.8982035928143712
-0.8982035928143712 x 100 = -89.82%