-99.22% is the change from 256 to 2
Calculation steps:
[( 2 - 256 ) ÷ 256] x 100 = -99.22%
Formula
Percentage change = [(2 - 256) / 256] x 100
Subtract the new number by the original number
2 - 256 = -254
-254 ÷ 256 = -0.9921875
-0.9921875 x 100 = -99.22%