977.92% is the change from 77 to 830
Calculation steps:
[( 830 - 77 ) ÷ 77] x 100 = 977.92%
Formula
Percentage change = [(830 - 77) / 77] x 100
Subtract the new number by the original number
830 - 77 = 753
753 ÷ 77 = 9.779220779220779
9.779220779220779 x 100 = 977.92%