-67.58% is the change from 256 to 83
Calculation steps:
[( 83 - 256 ) ÷ 256] x 100 = -67.58%
Formula
Percentage change = [(83 - 256) / 256] x 100
Subtract the new number by the original number
83 - 256 = -173
-173 ÷ 256 = -0.67578125
-0.67578125 x 100 = -67.58%