-90.1% is the change from 808 to 80
Calculation steps:
[( 80 - 808 ) ÷ 808] x 100 = -90.1%
Formula
Percentage change = [(80 - 808) / 808] x 100
Subtract the new number by the original number
80 - 808 = -728
-728 ÷ 808 = -0.900990099009901
-0.900990099009901 x 100 = -90.1%