-87.12% is the change from 815 to 105
Calculation steps:
[( 105 - 815 ) ÷ 815] x 100 = -87.12%
Formula
Percentage change = [(105 - 815) / 815] x 100
Subtract the new number by the original number
105 - 815 = -710
-710 ÷ 815 = -0.8711656441717791
-0.8711656441717791 x 100 = -87.12%