-79.69% is the change from 512 to 104
Calculation steps:
[( 104 - 512 ) ÷ 512] x 100 = -79.69%
Formula
Percentage change = [(104 - 512) / 512] x 100
Subtract the new number by the original number
104 - 512 = -408
-408 ÷ 512 = -0.796875
-0.796875 x 100 = -79.69%