-81.64% is the change from 839 to 154
Calculation steps:
[( 154 - 839 ) ÷ 839] x 100 = -81.64%
Formula
Percentage change = [(154 - 839) / 839] x 100
Subtract the new number by the original number
154 - 839 = -685
-685 ÷ 839 = -0.8164481525625745
-0.8164481525625745 x 100 = -81.64%