-90.37% is the change from 509 to 49
Calculation steps:
[( 49 - 509 ) ÷ 509] x 100 = -90.37%
Formula
Percentage change = [(49 - 509) / 509] x 100
Subtract the new number by the original number
49 - 509 = -460
-460 ÷ 509 = -0.9037328094302554
-0.9037328094302554 x 100 = -90.37%