-90.58% is the change from 520 to 49
Calculation steps:
[( 49 - 520 ) ÷ 520] x 100 = -90.58%
Formula
Percentage change = [(49 - 520) / 520] x 100
Subtract the new number by the original number
49 - 520 = -471
-471 ÷ 520 = -0.9057692307692308
-0.9057692307692308 x 100 = -90.58%