-67.19% is the change from 256 to 84
Calculation steps:
[( 84 - 256 ) ÷ 256] x 100 = -67.19%
Formula
Percentage change = [(84 - 256) / 256] x 100
Subtract the new number by the original number
84 - 256 = -172
-172 ÷ 256 = -0.671875
-0.671875 x 100 = -67.19%