-81.22% is the change from 820 to 154
Calculation steps:
[( 154 - 820 ) ÷ 820] x 100 = -81.22%
Formula
Percentage change = [(154 - 820) / 820] x 100
Subtract the new number by the original number
154 - 820 = -666
-666 ÷ 820 = -0.8121951219512196
-0.8121951219512196 x 100 = -81.22%