-26.56% is the change from 256 to 188
Calculation steps:
[( 188 - 256 ) ÷ 256] x 100 = -26.56%
Formula
Percentage change = [(188 - 256) / 256] x 100
Subtract the new number by the original number
188 - 256 = -68
-68 ÷ 256 = -0.265625
-0.265625 x 100 = -26.56%