-80.58% is the change from 520 to 101
Calculation steps:
[( 101 - 520 ) ÷ 520] x 100 = -80.58%
Formula
Percentage change = [(101 - 520) / 520] x 100
Subtract the new number by the original number
101 - 520 = -419
-419 ÷ 520 = -0.8057692307692308
-0.8057692307692308 x 100 = -80.58%