-84.93% is the change from 531 to 80
Calculation steps:
[( 80 - 531 ) ÷ 531] x 100 = -84.93%
Formula
Percentage change = [(80 - 531) / 531] x 100
Subtract the new number by the original number
80 - 531 = -451
-451 ÷ 531 = -0.8493408662900188
-0.8493408662900188 x 100 = -84.93%