-32.81% is the change from 256 to 172
Calculation steps:
[( 172 - 256 ) ÷ 256] x 100 = -32.81%
Formula
Percentage change = [(172 - 256) / 256] x 100
Subtract the new number by the original number
172 - 256 = -84
-84 ÷ 256 = -0.328125
-0.328125 x 100 = -32.81%