-84.96% is the change from 512 to 77
Calculation steps:
[( 77 - 512 ) ÷ 512] x 100 = -84.96%
Formula
Percentage change = [(77 - 512) / 512] x 100
Subtract the new number by the original number
77 - 512 = -435
-435 ÷ 512 = -0.849609375
-0.849609375 x 100 = -84.96%