-83.79% is the change from 512 to 83
Calculation steps:
[( 83 - 512 ) ÷ 512] x 100 = -83.79%
Formula
Percentage change = [(83 - 512) / 512] x 100
Subtract the new number by the original number
83 - 512 = -429
-429 ÷ 512 = -0.837890625
-0.837890625 x 100 = -83.79%