-51.95% is the change from 512 to 246
Calculation steps:
[( 246 - 512 ) ÷ 512] x 100 = -51.95%
Formula
Percentage change = [(246 - 512) / 512] x 100
Subtract the new number by the original number
246 - 512 = -266
-266 ÷ 512 = -0.51953125
-0.51953125 x 100 = -51.95%