317.09% is the change from 199 to 830
Calculation steps:
[( 830 - 199 ) ÷ 199] x 100 = 317.09%
Formula
Percentage change = [(830 - 199) / 199] x 100
Subtract the new number by the original number
830 - 199 = 631
631 ÷ 199 = 3.170854271356784
3.170854271356784 x 100 = 317.09%