-15.48% is the change from 155 to 131
Calculation steps:
[( 131 - 155 ) ÷ 155] x 100 = -15.48%
Formula
Percentage change = [(131 - 155) / 155] x 100
Subtract the new number by the original number
131 - 155 = -24
-24 ÷ 155 = -0.15483870967741936
-0.15483870967741936 x 100 = -15.48%