-38.67% is the change from 256 to 157
Calculation steps:
[( 157 - 256 ) ÷ 256] x 100 = -38.67%
Formula
Percentage change = [(157 - 256) / 256] x 100
Subtract the new number by the original number
157 - 256 = -99
-99 ÷ 256 = -0.38671875
-0.38671875 x 100 = -38.67%