-89.75% is the change from 800 to 82
Calculation steps:
[( 82 - 800 ) ÷ 800] x 100 = -89.75%
Formula
Percentage change = [(82 - 800) / 800] x 100
Subtract the new number by the original number
82 - 800 = -718
-718 ÷ 800 = -0.8975
-0.8975 x 100 = -89.75%