-50.32% is the change from 155 to 77
Calculation steps:
[( 77 - 155 ) ÷ 155] x 100 = -50.32%
Formula
Percentage change = [(77 - 155) / 155] x 100
Subtract the new number by the original number
77 - 155 = -78
-78 ÷ 155 = -0.5032258064516129
-0.5032258064516129 x 100 = -50.32%