-82.45% is the change from 809 to 142
Calculation steps:
[( 142 - 809 ) ÷ 809] x 100 = -82.45%
Formula
Percentage change = [(142 - 809) / 809] x 100
Subtract the new number by the original number
142 - 809 = -667
-667 ÷ 809 = -0.8244746600741656
-0.8244746600741656 x 100 = -82.45%