-39.97% is the change from 668 to 401
Calculation steps:
[( 401 - 668 ) ÷ 668] x 100 = -39.97%
Formula
Percentage change = [(401 - 668) / 668] x 100
Subtract the new number by the original number
401 - 668 = -267
-267 ÷ 668 = -0.3997005988023952
-0.3997005988023952 x 100 = -39.97%