-89% is the change from 809 to 89
Calculation steps:
[( 89 - 809 ) ÷ 809] x 100 = -89%
Formula
Percentage change = [(89 - 809) / 809] x 100
Subtract the new number by the original number
89 - 809 = -720
-720 ÷ 809 = -0.8899876390605687
-0.8899876390605687 x 100 = -89%