-97.69% is the change from 520 to 12
Calculation steps:
[( 12 - 520 ) ÷ 520] x 100 = -97.69%
Formula
Percentage change = [(12 - 520) / 520] x 100
Subtract the new number by the original number
12 - 520 = -508
-508 ÷ 520 = -0.9769230769230769
-0.9769230769230769 x 100 = -97.69%