-90.32% is the change from 155 to 15
Calculation steps:
[( 15 - 155 ) ÷ 155] x 100 = -90.32%
Formula
Percentage change = [(15 - 155) / 155] x 100
Subtract the new number by the original number
15 - 155 = -140
-140 ÷ 155 = -0.9032258064516129
-0.9032258064516129 x 100 = -90.32%