-21.09% is the change from 512 to 404
Calculation steps:
[( 404 - 512 ) ÷ 512] x 100 = -21.09%
Formula
Percentage change = [(404 - 512) / 512] x 100
Subtract the new number by the original number
404 - 512 = -108
-108 ÷ 512 = -0.2109375
-0.2109375 x 100 = -21.09%