-30.66% is the change from 512 to 355
Calculation steps:
[( 355 - 512 ) ÷ 512] x 100 = -30.66%
Formula
Percentage change = [(355 - 512) / 512] x 100
Subtract the new number by the original number
355 - 512 = -157
-157 ÷ 512 = -0.306640625
-0.306640625 x 100 = -30.66%