-35.48% is the change from 155 to 100
Calculation steps:
[( 100 - 155 ) ÷ 155] x 100 = -35.48%
Formula
Percentage change = [(100 - 155) / 155] x 100
Subtract the new number by the original number
100 - 155 = -55
-55 ÷ 155 = -0.3548387096774194
-0.3548387096774194 x 100 = -35.48%