-89.45% is the change from 256 to 27
Calculation steps:
[( 27 - 256 ) ÷ 256] x 100 = -89.45%
Formula
Percentage change = [(27 - 256) / 256] x 100
Subtract the new number by the original number
27 - 256 = -229
-229 ÷ 256 = -0.89453125
-0.89453125 x 100 = -89.45%