-76.56% is the change from 512 to 120
Calculation steps:
[( 120 - 512 ) ÷ 512] x 100 = -76.56%
Formula
Percentage change = [(120 - 512) / 512] x 100
Subtract the new number by the original number
120 - 512 = -392
-392 ÷ 512 = -0.765625
-0.765625 x 100 = -76.56%