-8.55% is the change from 842 to 770
Calculation steps:
[( 770 - 842 ) ÷ 842] x 100 = -8.55%
Formula
Percentage change = [(770 - 842) / 842] x 100
Subtract the new number by the original number
770 - 842 = -72
-72 ÷ 842 = -0.0855106888361045
-0.0855106888361045 x 100 = -8.55%