-82.58% is the change from 815 to 142
Calculation steps:
[( 142 - 815 ) ÷ 815] x 100 = -82.58%
Formula
Percentage change = [(142 - 815) / 815] x 100
Subtract the new number by the original number
142 - 815 = -673
-673 ÷ 815 = -0.8257668711656442
-0.8257668711656442 x 100 = -82.58%