-41.09% is the change from 864 to 509
Calculation steps:
[( 509 - 864 ) ÷ 864] x 100 = -41.09%
Formula
Percentage change = [(509 - 864) / 864] x 100
Subtract the new number by the original number
509 - 864 = -355
-355 ÷ 864 = -0.41087962962962965
-0.41087962962962965 x 100 = -41.09%