-80.19% is the change from 520 to 103
Calculation steps:
[( 103 - 520 ) ÷ 520] x 100 = -80.19%
Formula
Percentage change = [(103 - 520) / 520] x 100
Subtract the new number by the original number
103 - 520 = -417
-417 ÷ 520 = -0.801923076923077
-0.801923076923077 x 100 = -80.19%