-35.68% is the change from 398 to 256
Calculation steps:
[( 256 - 398 ) ÷ 398] x 100 = -35.68%
Formula
Percentage change = [(256 - 398) / 398] x 100
Subtract the new number by the original number
256 - 398 = -142
-142 ÷ 398 = -0.35678391959798994
-0.35678391959798994 x 100 = -35.68%