-82.76% is the change from 580 to 100
Calculation steps:
[( 100 - 580 ) ÷ 580] x 100 = -82.76%
Formula
Percentage change = [(100 - 580) / 580] x 100
Subtract the new number by the original number
100 - 580 = -480
-480 ÷ 580 = -0.8275862068965517
-0.8275862068965517 x 100 = -82.76%