-9.2% is the change from 848 to 770
Calculation steps:
[( 770 - 848 ) ÷ 848] x 100 = -9.2%
Formula
Percentage change = [(770 - 848) / 848] x 100
Subtract the new number by the original number
770 - 848 = -78
-78 ÷ 848 = -0.09198113207547169
-0.09198113207547169 x 100 = -9.2%