-7.78% is the change from 835 to 770
Calculation steps:
[( 770 - 835 ) ÷ 835] x 100 = -7.78%
Formula
Percentage change = [(770 - 835) / 835] x 100
Subtract the new number by the original number
770 - 835 = -65
-65 ÷ 835 = -0.07784431137724551
-0.07784431137724551 x 100 = -7.78%