-90.56% is the change from 519 to 49
Calculation steps:
[( 49 - 519 ) ÷ 519] x 100 = -90.56%
Formula
Percentage change = [(49 - 519) / 519] x 100
Subtract the new number by the original number
49 - 519 = -470
-470 ÷ 519 = -0.905587668593449
-0.905587668593449 x 100 = -90.56%