-80.71% is the change from 840 to 162
Calculation steps:
[( 162 - 840 ) ÷ 840] x 100 = -80.71%
Formula
Percentage change = [(162 - 840) / 840] x 100
Subtract the new number by the original number
162 - 840 = -678
-678 ÷ 840 = -0.8071428571428572
-0.8071428571428572 x 100 = -80.71%