-79.1% is the change from 823 to 172
Calculation steps:
[( 172 - 823 ) ÷ 823] x 100 = -79.1%
Formula
Percentage change = [(172 - 823) / 823] x 100
Subtract the new number by the original number
172 - 823 = -651
-651 ÷ 823 = -0.7910085054678008
-0.7910085054678008 x 100 = -79.1%