-54.71% is the change from 170 to 77
Calculation steps:
[( 77 - 170 ) ÷ 170] x 100 = -54.71%
Formula
Percentage change = [(77 - 170) / 170] x 100
Subtract the new number by the original number
77 - 170 = -93
-93 ÷ 170 = -0.5470588235294118
-0.5470588235294118 x 100 = -54.71%