306.86% is the change from 204 to 830
Calculation steps:
[( 830 - 204 ) ÷ 204] x 100 = 306.86%
Formula
Percentage change = [(830 - 204) / 204] x 100
Subtract the new number by the original number
830 - 204 = 626
626 ÷ 204 = 3.0686274509803924
3.0686274509803924 x 100 = 306.86%