-10.78% is the change from 770 to 687
Calculation steps:
[( 687 - 770 ) ÷ 770] x 100 = -10.78%
Formula
Percentage change = [(687 - 770) / 770] x 100
Subtract the new number by the original number
687 - 770 = -83
-83 ÷ 770 = -0.10779220779220779
-0.10779220779220779 x 100 = -10.78%