-25% is the change from 512 to 384
Calculation steps:
[( 384 - 512 ) ÷ 512] x 100 = -25%
Formula
Percentage change = [(384 - 512) / 512] x 100
Subtract the new number by the original number
384 - 512 = -128
-128 ÷ 512 = -0.25
-0.25 x 100 = -25%
Example