-89.91% is the change from 823 to 83
Calculation steps:
[( 83 - 823 ) ÷ 823] x 100 = -89.91%
Formula
Percentage change = [(83 - 823) / 823] x 100
Subtract the new number by the original number
83 - 823 = -740
-740 ÷ 823 = -0.8991494532199271
-0.8991494532199271 x 100 = -89.91%