-51.17% is the change from 512 to 250
Calculation steps:
[( 250 - 512 ) ÷ 512] x 100 = -51.17%
Formula
Percentage change = [(250 - 512) / 512] x 100
Subtract the new number by the original number
250 - 512 = -262
-262 ÷ 512 = -0.51171875
-0.51171875 x 100 = -51.17%