-39.69% is the change from 257 to 155
Calculation steps:
[( 155 - 257 ) ÷ 257] x 100 = -39.69%
Formula
Percentage change = [(155 - 257) / 257] x 100
Subtract the new number by the original number
155 - 257 = -102
-102 ÷ 257 = -0.3968871595330739
-0.3968871595330739 x 100 = -39.69%