-57.81% is the change from 512 to 216
Calculation steps:
[( 216 - 512 ) ÷ 512] x 100 = -57.81%
Formula
Percentage change = [(216 - 512) / 512] x 100
Subtract the new number by the original number
216 - 512 = -296
-296 ÷ 512 = -0.578125
-0.578125 x 100 = -57.81%