30.71% is the change from 635 to 830
Calculation steps:
[( 830 - 635 ) ÷ 635] x 100 = 30.71%
Formula
Percentage change = [(830 - 635) / 635] x 100
Subtract the new number by the original number
830 - 635 = 195
195 ÷ 635 = 0.30708661417322836
0.30708661417322836 x 100 = 30.71%