-93.95% is the change from 512 to 31
Calculation steps:
[( 31 - 512 ) ÷ 512] x 100 = -93.95%
Formula
Percentage change = [(31 - 512) / 512] x 100
Subtract the new number by the original number
31 - 512 = -481
-481 ÷ 512 = -0.939453125
-0.939453125 x 100 = -93.95%