-30.08% is the change from 256 to 179
Calculation steps:
[( 179 - 256 ) ÷ 256] x 100 = -30.08%
Formula
Percentage change = [(179 - 256) / 256] x 100
Subtract the new number by the original number
179 - 256 = -77
-77 ÷ 256 = -0.30078125
-0.30078125 x 100 = -30.08%