-81.73% is the change from 821 to 150
Calculation steps:
[( 150 - 821 ) ÷ 821] x 100 = -81.73%
Formula
Percentage change = [(150 - 821) / 821] x 100
Subtract the new number by the original number
150 - 821 = -671
-671 ÷ 821 = -0.8172959805115713
-0.8172959805115713 x 100 = -81.73%