-81.12% is the change from 842 to 159
Calculation steps:
[( 159 - 842 ) ÷ 842] x 100 = -81.12%
Formula
Percentage change = [(159 - 842) / 842] x 100
Subtract the new number by the original number
159 - 842 = -683
-683 ÷ 842 = -0.8111638954869359
-0.8111638954869359 x 100 = -81.12%