-78.13% is the change from 256 to 56
Calculation steps:
[( 56 - 256 ) ÷ 256] x 100 = -78.13%
Formula
Percentage change = [(56 - 256) / 256] x 100
Subtract the new number by the original number
56 - 256 = -200
-200 ÷ 256 = -0.78125
-0.78125 x 100 = -78.13%