-84.81% is the change from 520 to 79
Calculation steps:
[( 79 - 520 ) ÷ 520] x 100 = -84.81%
Formula
Percentage change = [(79 - 520) / 520] x 100
Subtract the new number by the original number
79 - 520 = -441
-441 ÷ 520 = -0.8480769230769231
-0.8480769230769231 x 100 = -84.81%