-50.39% is the change from 258 to 128
Calculation steps:
[( 128 - 258 ) ÷ 258] x 100 = -50.39%
Formula
Percentage change = [(128 - 258) / 258] x 100
Subtract the new number by the original number
128 - 258 = -130
-130 ÷ 258 = -0.5038759689922481
-0.5038759689922481 x 100 = -50.39%