-89.45% is the change from 512 to 54
Calculation steps:
[( 54 - 512 ) ÷ 512] x 100 = -89.45%
Formula
Percentage change = [(54 - 512) / 512] x 100
Subtract the new number by the original number
54 - 512 = -458
-458 ÷ 512 = -0.89453125
-0.89453125 x 100 = -89.45%