-95.09% is the change from 509 to 25
Calculation steps:
[( 25 - 509 ) ÷ 509] x 100 = -95.09%
Formula
Percentage change = [(25 - 509) / 509] x 100
Subtract the new number by the original number
25 - 509 = -484
-484 ÷ 509 = -0.9508840864440079
-0.9508840864440079 x 100 = -95.09%