-20.31% is the change from 256 to 204
Calculation steps:
[( 204 - 256 ) ÷ 256] x 100 = -20.31%
Formula
Percentage change = [(204 - 256) / 256] x 100
Subtract the new number by the original number
204 - 256 = -52
-52 ÷ 256 = -0.203125
-0.203125 x 100 = -20.31%