-80.08% is the change from 512 to 102
Calculation steps:
[( 102 - 512 ) ÷ 512] x 100 = -80.08%
Formula
Percentage change = [(102 - 512) / 512] x 100
Subtract the new number by the original number
102 - 512 = -410
-410 ÷ 512 = -0.80078125
-0.80078125 x 100 = -80.08%