-85.19% is the change from 520 to 77
Calculation steps:
[( 77 - 520 ) ÷ 520] x 100 = -85.19%
Formula
Percentage change = [(77 - 520) / 520] x 100
Subtract the new number by the original number
77 - 520 = -443
-443 ÷ 520 = -0.8519230769230769
-0.8519230769230769 x 100 = -85.19%