-87.39% is the change from 809 to 102
Calculation steps:
[( 102 - 809 ) ÷ 809] x 100 = -87.39%
Formula
Percentage change = [(102 - 809) / 809] x 100
Subtract the new number by the original number
102 - 809 = -707
-707 ÷ 809 = -0.8739184177997528
-0.8739184177997528 x 100 = -87.39%