-90.4% is the change from 823 to 79
Calculation steps:
[( 79 - 823 ) ÷ 823] x 100 = -90.4%
Formula
Percentage change = [(79 - 823) / 823] x 100
Subtract the new number by the original number
79 - 823 = -744
-744 ÷ 823 = -0.9040097205346294
-0.9040097205346294 x 100 = -90.4%