-78.52% is the change from 256 to 55
Calculation steps:
[( 55 - 256 ) ÷ 256] x 100 = -78.52%
Formula
Percentage change = [(55 - 256) / 256] x 100
Subtract the new number by the original number
55 - 256 = -201
-201 ÷ 256 = -0.78515625
-0.78515625 x 100 = -78.52%