-82.86% is the change from 840 to 144
Calculation steps:
[( 144 - 840 ) ÷ 840] x 100 = -82.86%
Formula
Percentage change = [(144 - 840) / 840] x 100
Subtract the new number by the original number
144 - 840 = -696
-696 ÷ 840 = -0.8285714285714286
-0.8285714285714286 x 100 = -82.86%