-90.23% is the change from 512 to 50
Calculation steps:
[( 50 - 512 ) ÷ 512] x 100 = -90.23%
Formula
Percentage change = [(50 - 512) / 512] x 100
Subtract the new number by the original number
50 - 512 = -462
-462 ÷ 512 = -0.90234375
-0.90234375 x 100 = -90.23%