-86.18% is the change from 579 to 80
Calculation steps:
[( 80 - 579 ) ÷ 579] x 100 = -86.18%
Formula
Percentage change = [(80 - 579) / 579] x 100
Subtract the new number by the original number
80 - 579 = -499
-499 ÷ 579 = -0.8618307426597582
-0.8618307426597582 x 100 = -86.18%