-77.73% is the change from 256 to 57
Calculation steps:
[( 57 - 256 ) ÷ 256] x 100 = -77.73%
Formula
Percentage change = [(57 - 256) / 256] x 100
Subtract the new number by the original number
57 - 256 = -199
-199 ÷ 256 = -0.77734375
-0.77734375 x 100 = -77.73%