-89.62% is the change from 809 to 84
Calculation steps:
[( 84 - 809 ) ÷ 809] x 100 = -89.62%
Formula
Percentage change = [(84 - 809) / 809] x 100
Subtract the new number by the original number
84 - 809 = -725
-725 ÷ 809 = -0.896168108776267
-0.896168108776267 x 100 = -89.62%