-82.7% is the change from 821 to 142
Calculation steps:
[( 142 - 821 ) ÷ 821] x 100 = -82.7%
Formula
Percentage change = [(142 - 821) / 821] x 100
Subtract the new number by the original number
142 - 821 = -679
-679 ÷ 821 = -0.8270401948842875
-0.8270401948842875 x 100 = -82.7%