-52.73% is the change from 256 to 121
Calculation steps:
[( 121 - 256 ) ÷ 256] x 100 = -52.73%
Formula
Percentage change = [(121 - 256) / 256] x 100
Subtract the new number by the original number
121 - 256 = -135
-135 ÷ 256 = -0.52734375
-0.52734375 x 100 = -52.73%