-39.82% is the change from 668 to 402
Calculation steps:
[( 402 - 668 ) ÷ 668] x 100 = -39.82%
Formula
Percentage change = [(402 - 668) / 668] x 100
Subtract the new number by the original number
402 - 668 = -266
-266 ÷ 668 = -0.39820359281437123
-0.39820359281437123 x 100 = -39.82%