-97.66% is the change from 512 to 12
Calculation steps:
[( 12 - 512 ) ÷ 512] x 100 = -97.66%
Formula
Percentage change = [(12 - 512) / 512] x 100
Subtract the new number by the original number
12 - 512 = -500
-500 ÷ 512 = -0.9765625
-0.9765625 x 100 = -97.66%