-45.7% is the change from 256 to 139
Calculation steps:
[( 139 - 256 ) ÷ 256] x 100 = -45.7%
Formula
Percentage change = [(139 - 256) / 256] x 100
Subtract the new number by the original number
139 - 256 = -117
-117 ÷ 256 = -0.45703125
-0.45703125 x 100 = -45.7%