-78.91% is the change from 512 to 108
Calculation steps:
[( 108 - 512 ) ÷ 512] x 100 = -78.91%
Formula
Percentage change = [(108 - 512) / 512] x 100
Subtract the new number by the original number
108 - 512 = -404
-404 ÷ 512 = -0.7890625
-0.7890625 x 100 = -78.91%