-78.91% is the change from 256 to 54
Calculation steps:
[( 54 - 256 ) ÷ 256] x 100 = -78.91%
Formula
Percentage change = [(54 - 256) / 256] x 100
Subtract the new number by the original number
54 - 256 = -202
-202 ÷ 256 = -0.7890625
-0.7890625 x 100 = -78.91%