-84.54% is the change from 511 to 79
Calculation steps:
[( 79 - 511 ) ÷ 511] x 100 = -84.54%
Formula
Percentage change = [(79 - 511) / 511] x 100
Subtract the new number by the original number
79 - 511 = -432
-432 ÷ 511 = -0.8454011741682974
-0.8454011741682974 x 100 = -84.54%