-96.93% is the change from 815 to 25
Calculation steps:
[( 25 - 815 ) ÷ 815] x 100 = -96.93%
Formula
Percentage change = [(25 - 815) / 815] x 100
Subtract the new number by the original number
25 - 815 = -790
-790 ÷ 815 = -0.9693251533742331
-0.9693251533742331 x 100 = -96.93%