-17.42% is the change from 155 to 128
Calculation steps:
[( 128 - 155 ) ÷ 155] x 100 = -17.42%
Formula
Percentage change = [(128 - 155) / 155] x 100
Subtract the new number by the original number
128 - 155 = -27
-27 ÷ 155 = -0.17419354838709677
-0.17419354838709677 x 100 = -17.42%