-84.8% is the change from 842 to 128
Calculation steps:
[( 128 - 842 ) ÷ 842] x 100 = -84.8%
Formula
Percentage change = [(128 - 842) / 842] x 100
Subtract the new number by the original number
128 - 842 = -714
-714 ÷ 842 = -0.8479809976247031
-0.8479809976247031 x 100 = -84.8%