-85.48% is the change from 840 to 122
Calculation steps:
[( 122 - 840 ) ÷ 840] x 100 = -85.48%
Formula
Percentage change = [(122 - 840) / 840] x 100
Subtract the new number by the original number
122 - 840 = -718
-718 ÷ 840 = -0.8547619047619047
-0.8547619047619047 x 100 = -85.48%