-17.55% is the change from 188 to 155
Calculation steps:
[( 155 - 188 ) ÷ 188] x 100 = -17.55%
Formula
Percentage change = [(155 - 188) / 188] x 100
Subtract the new number by the original number
155 - 188 = -33
-33 ÷ 188 = -0.17553191489361702
-0.17553191489361702 x 100 = -17.55%