-40.74% is the change from 864 to 512
Calculation steps:
[( 512 - 864 ) ÷ 864] x 100 = -40.74%
Formula
Percentage change = [(512 - 864) / 864] x 100
Subtract the new number by the original number
512 - 864 = -352
-352 ÷ 864 = -0.4074074074074074
-0.4074074074074074 x 100 = -40.74%