-8.2% is the change from 256 to 235
Calculation steps:
[( 235 - 256 ) ÷ 256] x 100 = -8.2%
Formula
Percentage change = [(235 - 256) / 256] x 100
Subtract the new number by the original number
235 - 256 = -21
-21 ÷ 256 = -0.08203125
-0.08203125 x 100 = -8.2%