-67.97% is the change from 256 to 82
Calculation steps:
[( 82 - 256 ) ÷ 256] x 100 = -67.97%
Formula
Percentage change = [(82 - 256) / 256] x 100
Subtract the new number by the original number
82 - 256 = -174
-174 ÷ 256 = -0.6796875
-0.6796875 x 100 = -67.97%