-84.04% is the change from 520 to 83
Calculation steps:
[( 83 - 520 ) ÷ 520] x 100 = -84.04%
Formula
Percentage change = [(83 - 520) / 520] x 100
Subtract the new number by the original number
83 - 520 = -437
-437 ÷ 520 = -0.8403846153846154
-0.8403846153846154 x 100 = -84.04%