-85.66% is the change from 579 to 83
Calculation steps:
[( 83 - 579 ) ÷ 579] x 100 = -85.66%
Formula
Percentage change = [(83 - 579) / 579] x 100
Subtract the new number by the original number
83 - 579 = -496
-496 ÷ 579 = -0.8566493955094991
-0.8566493955094991 x 100 = -85.66%