-80.48% is the change from 840 to 164
Calculation steps:
[( 164 - 840 ) ÷ 840] x 100 = -80.48%
Formula
Percentage change = [(164 - 840) / 840] x 100
Subtract the new number by the original number
164 - 840 = -676
-676 ÷ 840 = -0.8047619047619048
-0.8047619047619048 x 100 = -80.48%