7.79% is the change from 770 to 830
Calculation steps:
[( 830 - 770 ) ÷ 770] x 100 = 7.79%
Formula
Percentage change = [(830 - 770) / 770] x 100
Subtract the new number by the original number
830 - 770 = 60
60 ÷ 770 = 0.07792207792207792
0.07792207792207792 x 100 = 7.79%