-75.83% is the change from 509 to 123
Calculation steps:
[( 123 - 509 ) ÷ 509] x 100 = -75.83%
Formula
Percentage change = [(123 - 509) / 509] x 100
Subtract the new number by the original number
123 - 509 = -386
-386 ÷ 509 = -0.7583497053045186
-0.7583497053045186 x 100 = -75.83%