-6.39% is the change from 830 to 777
Calculation steps:
[( 777 - 830 ) ÷ 830] x 100 = -6.39%
Formula
Percentage change = [(777 - 830) / 830] x 100
Subtract the new number by the original number
777 - 830 = -53
-53 ÷ 830 = -0.06385542168674699
-0.06385542168674699 x 100 = -6.39%